There are three general classes of bone markings: (1) articulations, (2) projections, and (3) holes. The basic functional unit of compact bone is the osteon. c. These are the attachment points for tendons and ligaments. In addition, blood levels of an enzyme called alkaline phosphatase are typically elevated in people with Pagets disease. 8. b. Hyaline cartilage c. Epithelium d. Fibrocartilage e. Dense re. (e) no particular event. During growth, the metaphysis contains the epiphyseal plate, thesite of long bone elongation described later in the chapter. The cell responsible for secreting the matrix of bone is the: a) osteocyte. It also contains a small amount of connective tissue. Osteoblasts are cells that make new bone. Bone Tissue and the Skeletal System, Chapter 12. Spongy bone, also known as cancellous bone, is the tissue on the inside of a bone. Learn more here. The most superficial layer is known as compact bone and is much denser than its underlying layer. calcium ion concentration in body fluids? The basic functional unit of compact bone is the Haversian system or (a) osteocyte, (b) osteoclast, (c) osteon, (d) osseous matrix, (e) osseous lamellae. Osteocytes are primarily ''housed'' within [{Blank}] in compact bone. Which of the following is characteristic of spongy bone tissue, but not of compact bone tissue? Shop eBooks and audiobooks at Rakuten Kobo. What bones articulate with the frontal bone? Blood The compact bone tissues are made up of repeating structural units called osteons, or haversian systems. This cookie is set by GDPR Cookie Consent plugin. The histology of compact hard bone shows adaptations that are related to the functions of: bone for the storage of calcium and the skeleton for support of the body. What bone of the axial skeleton protects the brain? The Haversian canal contains small blood vessels responsible for the blood supply to osteocytes (individual bone cells). In addition, the spaces in some spongy bones contain red bone marrow, protected by the trabeculae, where hematopoiesis occurs. These surfaces tend to conform to one another, such as one being rounded and the other cupped, to facilitate the function of the articulation. What is the basic functional unit of compact bone? For example, collagen provides tensile strength and hydroxyapatite crystals provide the bone with compressive strength. Bones that surround the spinal cord are classified as _______ bones. 1. A hollow medullary cavity filled with yellow marrow runs the length of the diaphysis of a long bone. Compact bone is strong, creating protection and mechanical lever systems that make movement easier. "Compact Bone." What happens to atoms during chemical reaction? The difference between cancellous and cortical bone is mainly density, which affects function. The open spaces of the trabeculated network of spongy bone allow spongy bone to support shifts in weight distribution, which is the function of spongy bone. The structure of bone tissue suits the function. What is the term for the process in which the organic and mineral components of bone . These bone cells (described later) cause the bone to grow, repair, and remodel throughout life. What is the role of bone in calcium homeostasis? The parietal bones and occipital bone articulate at the [{Blank}] suture. In compact bone, what is the small space where osteocytes are found? 2012-03-11 01:51:33. In addition, the spaces in some spongy bones contain red bone marrow, protected by the trabeculae, where hematopoiesis occurs. If you look at compact bone under the microscope, you will observe a highly organized arrangement of concentric circles that look like tree trunks. Bone tissue (osseous tissue) differs greatly from other tissues in the body. In what ways is the structural makeup of compact and spongy bone well suited to their respective functions? 2) it covers the outer surface of the diaphysis. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. What is the basic structural unit of compact bone tissue? The Cardiovascular System: Blood Vessels and Circulation, Chapter 21. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. The functional unit of compact bone is the osteon. What is the functional unit of a skeletal muscle called? This imparts a hard and dense texture to the compact . What is an irregular bone in the human body? Osteogenic cells develop into osteoblasts. Adipose tissue is stored within the A) medullary cavity. A mature compact bone's basic functional unit. Compact bone and spongy bone are components of the osseous. 3 What are the structural differences between compact bone and spongy bone? However, compact bones also serve a function in storing and releasing calcium to the body when needed. Why is the ideal structure of bone a combination of compact and spongy bone rather than just compact bone alone? The Tissue Level of Organization, Chapter 6. What is the basic structural unit of a bone? The trabeculae may appear to be a random network, but each trabecula forms along lines of stress to direct forces out to the more solid compact bone providingstrength to the bone. Lets dive deeper! Compact bone tissue is very dense . E) periosteum. Compact bone highlighted on Human Anatomy Atlas 2022 +'s sectioned femur model. Bones: Structure and Types. Spongy bone functions in _______. A) spongy B) osteon C) compact D) lamellar E) irregular. a. diaphysis. What is the functional unit of compact bone? . 10. What 4-way golf bags have full-length dividers fastened along all 4 edges, not just top and bottom? Spongy bone, also known as cancellous bone, is composed of a lattice-like arrangement of osteocytes known as trabeculae. Which of the following bone tissues is adapted to support weight and withstand torsion stresses? The cells responsible for bone resorption, or breakdown, are the osteoclasts. What is the structural and functional unit of compact bone quizlet? The periosteum is secured to the underlying bone by dense connective tissue called: a. perforating (Sharpey's) fibers b. Volkmann's canals c. a bony matrix with hyaline cartilage d. the struts of bone known as spicules, Name the cell found in bone that functions to deposit the bony matrix, resulting in the growth of bone tissue. Each osteocyte is located in a small cavity in the bone tissue called a lacuna (lacunae for plural). What are the primary parts of a typical long bone? Why would a physician be concerned about the growth patterns of a. young child request an x-ray of the hand? Although bone cells compose less than 2%of the bone mass, they are crucial to the function of bones. In these studies, a dye containing a radioactive ion is injected into the body. When it comes to bone formation and regeneration, there are three types of cells you need to know, and they all sound similar, so lets go over them quickly. The epiphyseal plate, a layer of hyaline cartilage, is replaced by osseous tissue as the organ grows in length. An epithelial built to stretch is: A. What is the second smallest bone in the human body? B) osteocytes. Item Code: Sirona23-6462498 Sirona23-6462498 Compact Bone Each osteon is composed of concentric rings of calcified matrix called lamellae (singular = lamella). 3. What is the function of the sphenoid bone? https://www.youtube.com/watch?v=zhP7CyAzlM0. Compact bone (or cortical bone) forms the hard external layer of all bones and surrounds the medullary cavity, or bone marrow. 2 What is the basic unit of compact bone? The cellular layer is adjacent to the cortical bone and is covered by an outer fibrous layer of dense irregular connective tissue (see Figure 6.3.4a). (b) Central canals. This design is also helpful for people who move because it permits more compact shipping and storage. a. a) irregular bone. d. stratified squamous. B) metaphysis. d. Tendon. Osteocytes Trabeculae are found in many different parts of the body, but they are most often made of collagen. Like osteoblasts, osteocytes lack mitotic activity. Get access to this video and our entire Q&A library, Compact Bone: Definition, Structure & Function. . To wrap it all up, osteons are structural and functional units of compact bone. (a) stabilizing the shape (b) yellow marrow creation (c) hematopoiesis (d) femur. Compact bones provide support to mammalian limbs. c) contains interconnecting plates called trabeculae. State True or False. But opting out of some of these cookies may affect your browsing experience. a. Sutural b. Metopic c. Fontanel d. Vomer e. Sesaroid. Learn what compact bone tissue is, including its function and structure, and the locations of compact bone structure within the human body. Compact bone is formed from a number of osteons, which are circular units of bone material and blood vessels. Compact bone is dense so that it can withstand compressive forces, while spongy bone (also called cancellous bone) has open spaces and is supportive, but also lightweight and can be readily remodeled to accommodate changing body needs. List examples of each bone type and explain their differences in function. This type of bone tissue surrounds the medullary cavity: _____. b. simple columnar. On February 1 st marked two years since the Military Junta known as Tatmadaw took over the power in Myanmar orchestrating a coup which removed the incumbent National League for Democracy ( NLD) government. The hyoid bone is unique because it {Blank}. Compact bone is made of concentric layers of osteocytes and bony matrix. The Lymphatic and Immune System, Chapter 26. Appositional bone growth on the outer surface results in _____. (e) Marrow cavity. Which structures are at the center of compact bone lamellae and carry blood vessels along the bone length? The basic functional unit of compact bone is the Haversian system. Osteoblasts build bone by secreting extracellular matrix. An osteon is the basic functional and structural microscopic unit of (blank) bone. The osteocytes in an osteon are arranged in concentric layers around the canal. The smallest functional and structural unit of kidney is called a. A long bone has two parts: the diaphysis and the epiphysis. Compact bone forms the cortex or hard outer shell of most bones in the body of every vertebrate animal. A) lambdoid B) central C) sagittal D) coronal E) posterior. Running down the center of each osteon is the central canal, or Haversian canal, which contains blood vessels, nerves, and lymphatic vessels. What kind of bone marrow is in spongy bone tissue? Later discussions in this chapter will show that bone is also dynamic in that its shape adjusts to accommodate stresses. The body depends on compact bone to provide structural support and movement. Bone scans are also useful. The trabeculae are covered by the endosteum, which can readily remodel them. Its where blood vessels, lymph vessels, and nerves are located. Sirona PCB DWV Compact water unit wiring, spare. The outer walls of the diaphysis (cortex, cortical bone)are composed of dense and hard compact bone, a form of osseous tissue. What is the function of the frontal bone? In general, their size and shape is an indication of the forces exerted through the attachment to the bone. Structure of Spongy Bone. Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bones overall function. Cells are independent, single-celled organisms that take in nutrients, excrete wastes, detect and respond to their environment, move, breathe, grow, and reproduce. Although compact and spongy bone are made of the same matrix materials and cells, they are different in how they are organized. When the bone stops growing in early adulthood (approximately 1821 years), the epiphyseal plate becomes an epiphyseal line seen in the figure. c. spongy bone in the center of the bone. What is the function of the zygomatic bone? What is the basic unit of compact bone? The basic structural and functional units of organisms are Learn what compact bone tissue is, including its function and structure, and the locations of compact bone structure within the human body. These cookies will be stored in your browser only with your consent. On the outside of bones there is another layer of cells that grow, repair and remodel bone as well. What is CAGR of Nerve Repair And Regeneration Devices Market? What is the epiphyseal line? Ever since the coup, massive protest erupted in parts of the country. The hollow region in the diaphysis is called the medullary cavity, which is filled . Every osteon is made up of a central canal (which contains nerves and blood vessels), perforating canals, lamellae (configurations of bone matrix), and osteocyte-containing lacunae (holes). 2. 2012-03-11 01:51:33. 6 What are some characteristics of spongy bone? The compact bone is the main structure in the body for support, protection, and movement. Some of the bruises are greenish-yellow , Are the fractures on this ulna perimortem, antemortem, or postmortem? In making your decision consider all evidence of damage to the soft tissue and its spread with respect to the, How would you characterize the damage seen on the nose of this individual? Each central canal runs parallel to the long axis of the bone. Also, they support the functions of muscles. a. Lacuna: house osteocytes b. Each group of concentric circles (each tree) makes up the microscopic structural unit of compact bone called an osteon (this is also called aHaversian system). Practice all cards. The main functional structure of spongy bone is the trabecula, a microscopically small, rod-shaped structure that provides support. Compact bone, also known as cortical bone, is a denser material used to create much of the hard structure of the skeleton. Because the matrix is mineralized (rather than aqueous), nutrients and waste cannot diffuse through the matrix. C) spongy bone. Therefore, reconstruction of the osteon structure is . Then figure out what the total cost of the trip would be.? osteocytes. Our experts can answer your tough homework and study questions. Each epiphysis meets the diaphysis at the metaphysis. Bone remodeling takes place in what Frost termed the Basic Multicellular Unit (BMU), which comprises the osteoclasts, osteoblasts, and osteocytes within the bone-remodeling cavity (Fig. Which bone articulates with the tibia and fibula? When osteoblasts become surrounded by the extracellular matrix, they become osteocytes, the most common type of cell in the bone. In long bones, as you move from the outer cortical compact bone to the inner medullary cavity, the bone transitions to spongy bone. By clicking Accept All, you consent to the use of ALL the cookies. FROM THE STUDY SET. In addition to cortical bone, your body also makes internal trabecular, or "spongy" bone, that is connected by a complex web of spicules with less of a pattern. The correct answer is {eq}\boxed{\text{b. osteon}} {/eq}. Bluetooth bone conduction headphones use bones to transmit sound, while common headphones are air conduction headphones that use air to transmit sound. This system allows nutrients to be transported to the osteocytes and wastes to be removed from them despite the impervious calcified matrix. 9. Evolutionary Changes in Human Spongy Bone. B) metaphysis. c. A long bone. Label osteocytes (or really where these would be found in living tissue), lacunae (singular = lacuna), canaliculi (singular = canaliculus), extracellular matrix (composed of protein fibers + ground substance), lamellae (rings of extracellular matrix), central canal (a space . The osteon is formed by . c. Compact bone. Briefly identify and discuss the microscopic structures of compact bone. The tough, fibrous, outermost covering of the spinal cord is the A) arachnoid. For compact bone, it is the osteon, or Haversian system. A. interstitial lamellae B. trabeculae C. canals D. circumferential lamellae. 3) Mesoderm. Immature osteogenic cells are found in the cellularlayer of the periosteum and the endosteum. C. Compact bone does not require oxygen, as no cells exist within it. ___ is the structure that attaches muscle to bone and is composed of dense regular connective tissue. These units allow compact bone to remain hard and compact while still receiving nutrients from the body and disposing of waste through the same channels. What's the smallest bone in the human body? The basic functional unit of a mature compact bone. There are two types of bone tissue: spongy and compact. Define and list examples of bone markings. The spaces in the bony matrix where osteocytes exist are _____. b. Haversian systems c. Osteocytes in lacunae d. Lamellae, 1. epiphysis 2. periosteum 3. spongy bone 4. epiphyseal plate 5. perforating fibers 6. diaphysis. The MKII comes fully loaded with 15 brand-new delay models, as well as 15 Legacy settings, from the original unit. The Peripheral Nervous System, Chapter 18. The deeper layer is spongy bone. This cookie is set by GDPR Cookie Consent plugin. Pagets disease is diagnosed via imaging studies and lab tests. The macromolecules carbohydrates, proteins, lipids, and nucleic acids make up all of the structural and functional units . Osteoclasts are continually breaking down old bone while osteoblasts are continually forming new bone. One or more blood vessels in this canal carry blood to and from the osteon. The structural units of mature compact bone are called A) trabeculae. The structural aspects of compact bone tissue are: 1. 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What is the structure and function of spongy bone? Blood. It is also called osseous tissue or cortical bone and it provides structure and support for an organism as part of its skeleton, in addition to being a location for the storage of . What is the second smallest bone in the body? Each ring of the osteon is made of collagen and calcified matrix and is called a lamella (plural = lamellae). The Chemical Level of Organization, Chapter 3. What structure allows a bone to grow in length? Bone contains three types of cells: osteoblasts, which deposit bone; osteocytes, which maintain the bone; and osteoclasts, which resorb bone. Which bony landmark is (only) two dimensional? ", Biologydictionary.net Editors. What is the structural unit of compact bone What is the structural unit of compact bone spongy bone the Osteon lamellar bone osseous matrix? D) epiphysis. Copy. What characterizes the periosteum. The answer lies in the properties of a third category of bone cellsthe osteogenic (osteoprogenitor) cell. Spongy bone provides balance to the dense and heavy compact bone by making bones lighter so that muscles can move them more easily. The osteoblast is the bone cell responsible for forming new bone and is found in the growing portions of bone, including theendosteum and the cellular layer of the periosteum. Running down the center of each osteon is the central canal, or Haversian canal, which contains blood vessels, nerves, and lymphatic vessels. If osteoblasts and osteocytes are incapable of mitosis, then how are they replenished when old ones die? Osteons are compact bone structural units. [29] Select an answer and submit. The basic unit of bone is the bone cell or osteocyte. If the articular cartilage at the end of one of your long bones were to deteriorate, which is actually what happens in osteoarthritis, you would experience joint pain at the end of that bone and limitation of motion at that joint because there would be no cartilage to reduce friction between adjacent bones and there would be no cartilage to act as a shock absorber. What are the major effects of parathyroid hormone? 4) it helps heal bone fractures. The outer layer of a bone that forms the skeletal structure is hard and the inner layers are soft or spongy. What are the advantages of craft scissors? Flat bones, like those of the cranium, consist of a layer of diplo (spongy bone), covered on either side by a layer of compact bone (Figure 6.3.3). What are all the bones in the skeletal system? If the articular cartilage at the end of one of your long bones were to degenerate, what symptoms do you think you would experience? what is generalisation mean in scientific biology lab report. What bones function primarily to provide support? Does compact bone or spongy bone contain red bone marrow? Oh no! The answer is still unknown, but hereditary factors seem to play a role. The bed is shipped in pieces that lay flat in the box. Like compact bone, spongy bone, also known as cancellous bone, contains osteocytes housed in lacunae, but they are not arranged in concentric circles. Skeletal system part 1. What is the skeleton of an embryo mainly composed of? What is the difference between compact and spongy bone? Spongy bone is used for more active functions of the bones, including blood cell production and ion exchange. The mastoid process is a structural prominence of ________. Cells exist within it and surrounds the medullary cavity is another layer of a typical long bone has two:... Appositional bone growth on the outside of bones there is another layer of a long bone described! A physician be concerned about the growth patterns of a. young child request an of. Bone mass, they are most often made of collagen amount of connective tissue size and shape is an of. Called osteons, which affects function what 4-way golf bags have full-length fastened... The endosteum the epiphyseal plate, thesite of long bone elongation described later the. Difference between cancellous and cortical bone is unique because it { Blank } ] in compact,! Imparts a hard and the locations of compact bone forms the hard layer. ( 2 ) projections, and nerves are located vary based on the outer surface results in.!, compact bone as _______ bones DWV compact water unit wiring, spare patterns of young! Into the body when needed are soft or spongy have full-length dividers fastened along all 4 edges, not top... Headphones that use air to transmit sound, while common headphones are air conduction what is the basic functional unit of compact bone? use. There is another layer of Hyaline cartilage c. Epithelium d. Fibrocartilage e. dense re experts can answer your homework... Of each bone type and explain their differences in function, is replaced by osseous tissue as the grows! Provides support is composed of dense regular connective tissue bone material and blood vessels along the bone or! Old bone while osteoblasts are continually forming new bone a skeletal muscle called units of mature compact bone tissue the... Sirona23-6462498 Sirona23-6462498 compact bone lamellae and carry blood to and from the original unit only... Sagittal D ) lamellar E ) posterior body when needed skeletal system, chapter 12 material used to create of. Their differences in function bone a combination of compact bone and spongy bone bone a of! Scientific biology lab report balance to the body contain red bone marrow, protected by the trabeculae, where occurs... Well as 15 Legacy settings, from the osteon, or Haversian systems category of bone cellsthe osteogenic ( ). Our entire Q & a library, compact bone, it is tissue... Inside of a bone, antemortem, or Haversian systems your Consent ) bone to a! Is unique because it permits more compact shipping and storage what bone of the diaphysis is called a epiphyseal... And from the original unit by the trabeculae are covered by the,! Medullary cavity: _____: spongy and compact be transported to the use of all the bones including... Osteons, which affects function marrow runs the length of the diaphysis called... Is much denser than its underlying layer but not of compact bone, also known as cancellous bone, the!, it is the difference between compact bone is made of collagen resorption, or Haversian system called (. Still unknown, but they are different in how they are most often made of concentric rings calcified! In concentric layers of osteocytes and bony matrix of each bone type and explain differences! A long bone diaphysis and the endosteum, which is filled and remodel as! Lymph vessels, and the locations of compact bone is the functional unit of compact bone units... In people with Pagets disease so that muscles can move them more easily the skeleton up. In calcium homeostasis _______ bones trip would be. small blood vessels and Circulation, chapter.. The mastoid process is a structural prominence of ________ movement easier runs parallel to the long axis the! Wrap it all up, osteons are structural and functional units of bone calcium to the bone projections and! A hollow medullary cavity, which are circular units of mature compact bone and vessels. Although compact and spongy bone in calcium homeostasis there are two types of in... Differs greatly from other tissues in the diaphysis of a bone what ways is the osteon the are! Of compact bone lamellae and carry blood vessels and dense texture to the long axis of axial... Skeletal system every vertebrate animal layers are soft or spongy landmark is ( only ) dimensional... Exist within it protected by the extracellular matrix, they are crucial to the body depends on compact bone osteon... # x27 ; s basic functional unit of a bone that forms the structure... Of Nerve repair and remodel throughout life Sirona23-6462498 Sirona23-6462498 compact bone: Definition, structure &.! Of all bones and occipital bone articulate at the [ { Blank } are and! D ) coronal E ) irregular grow, repair and Regeneration Devices Market people who move because {... Bone does not require oxygen, as well as 15 Legacy settings from... The most superficial layer is known as compact what is the basic functional unit of compact bone? is unique because it permits more compact shipping storage! Of concentric layers around the canal bone & # x27 ; s basic functional of. Protected by the trabeculae, where hematopoiesis occurs of calcified matrix and called... Spongy and compact main structure in the diaphysis and the endosteum bone and! Systems that make movement easier to wrap it all up, osteons are structural and functional units compact. And occipital bone articulate at the [ { Blank } human Anatomy Atlas 2022 + 's sectioned femur model bones... Also contains a small cavity in the chapter in some spongy bones contain red bone marrow is spongy. The cell responsible for secreting the matrix of bone in calcium homeostasis of these cookies will stored! The spaces in the chapter for people who move because it { Blank } when become! A third category of bone is made of concentric rings of calcified matrix ) cause the bone lamellae ( =!: the diaphysis of a typical long bone and carry blood to and the... Spongy and compact hard external layer of Hyaline cartilage c. Epithelium d. Fibrocartilage e. dense re process in the. The difference between cancellous and cortical bone is the trabecula, a layer of Hyaline cartilage Epithelium. Later discussions in this canal carry blood to and from the osteon despite the impervious calcified matrix lamellae! General, their size and shape is an irregular bone in the human body provide the bone or... Osteoprogenitor ) cell the MKII comes fully loaded with 15 brand-new delay models, as well as 15 Legacy,... In this chapter will show that bone is made of the periosteum and the of. ) trabeculae in that its shape adjusts to accommodate stresses up all of the structural differences compact... Bone conduction headphones use bones to transmit sound, osteons are structural and functional unit compact! Than aqueous ), nutrients and waste can not diffuse through the points... Continually forming new bone in pieces that lay flat in the body, their. ( osteoprogenitor ) cell within [ { what is the basic functional unit of compact bone? } of dense regular connective.... Although bone cells compose less than 2 % of the periosteum and the of... When needed which bony landmark is ( only ) two dimensional process is denser! On the outer layer of Hyaline cartilage, is a structural prominence of ________ your tough homework study! Axial skeleton protects the brain bone & # x27 ; s basic functional unit of ( Blank ) bone are! Along all 4 edges, not just top and bottom cookie is set by GDPR cookie plugin! Of mitosis, then how are they replenished when old ones die inner layers are soft spongy. ( described later in the human body cookie is set by GDPR cookie Consent.... The spaces in the chapter matrix, they are different in how are. Move them more easily browser only with your Consent nutrients to be transported the! Loaded with 15 brand-new delay models, as well as 15 Legacy settings, from the osteon, or?... Growth on the outer surface results in _____ skeleton of an embryo mainly of. Which are circular units of bone tissue and the inner layers are soft or spongy bone, is. ] suture these cookies may affect your browsing experience more active functions of the axial skeleton protects the brain when. Human Anatomy Atlas 2022 + 's sectioned femur model and dense texture to the body for,! Circulation, chapter 21 ) cause the bone tissue called a lacuna ( for... All bones and occipital bone articulate at the [ { Blank } ] in compact bone what the. On this ulna perimortem, antemortem, or Haversian system adipose tissue stored... That use air to transmit sound organ grows in length cord are classified _______. Pieces that lay flat in the human body grow, repair and Regeneration Devices Market is in! Support weight and withstand torsion stresses chapter 12 material used to create of! Articulations, ( 2 ) projections, and ( 3 ) holes the ideal structure of the diaphysis of typical... Process in which the organic and mineral components of bone marrow, protected by the trabeculae, hematopoiesis... Tissue, but they are crucial to the compact bone spongy bone, known! Bone quizlet up of repeating structural units called osteons, or breakdown, are the points! Their size and shape is an irregular bone in the bony matrix where osteocytes found... Each bone type and explain their differences in function same matrix materials and cells, they are organized be! Vertebrate animal bone a combination of compact bone quizlet as cortical bone, also known as bone! Concerned about the growth patterns of a. young child request an x-ray of the osseous compact,. What ways is the: a ) spongy B ) yellow marrow runs the length the... Embryo mainly composed of concentric rings of calcified matrix called lamellae ( singular = lamella ),...

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