A&P ch 6 extra – Flashcards

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question
Which of the following is stored in bones?
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phosphate
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What is absolutely required for bone growth or healing from a fracture?
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osteoblasts
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The indicated osteocyte is located within layers of bony matrix termed ______.
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lamellae
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Which hormone is produced in bone and regulates bone formation, but also protects against diabetes mellitus?
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osteocalcin
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Bones are classified by whether they are weight bearing or protective in function.
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False
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A fracture in the shaft of a bone would be a break in the ________.
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diaphysis
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In adults, hematopoietic tissue is NOT found in ________.
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the medullary cavity of long bones
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What is the structural unit of compact bone?
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osteon
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Which of the following substances is NOT a component of the osteoid material secreted by the cells indicated by the arrow in panel A? glycoprotein proteoglycan collagen calcium
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calcium
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Bones are covered and lined by a protective tissue called periosteum. The inner (osteogenic) layer consists primarily of ________.
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osteoblasts and osteoclasts
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What causes osteoporosis?
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Osteoclasts out-pace osteoblasts due to low hormone production of the ovaries.
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Bones are constantly undergoing resorption for various reasons. Which of the following cells accomplishes this process?
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osteoclast
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Which description of bone cells is INCORRECT?
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Osteogenic cells can differentiate into osteoclasts.
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What kind of tissue is the forerunner of long bones in the embryo?
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hyaline cartilage
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Alice and James adopted a 3-year-old child from a developing country. They noticed that her legs were bowed and there were some deformities in her cranial and pelvic bones. They brought her to a physician for a diagnosis. What was the diagnosis, and what was the treatment for the disorder?
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The child most likely has rickets. Treatment is to increase the intake of calcium and vitamin D in the diet, and to get some sunshine every day.
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Flat bones consist of compact bone sandwiched between spongy bone.
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False
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The process of bones increasing in width is known as ________.
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appositional growth
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Wolff's law is concerned with ________.
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the thickness and shape of a bone being dependent on stresses placed upon it
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The periosteum is secured to the underlying bone by dense connective tissue called ________.
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perforating (Sharpey's) fibers
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What is endochondral ossification?
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the formation of bone from pre-existing hyaline cartilage models
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The osteon is ________.
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the structural unit of compact bone
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The cell responsible for secreting the matrix of bone is the ________.
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osteoblast
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Mrs. Mulligan goes to her dentist and, after having a couple of cavities filled, her dentist strongly suggests that she reduce her intake of sodas and increase her intake of calcium phosphates in the foods she eats. Why?
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Sodas are strong acids that can dissolve the calcium phosphate in bone and teeth.
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Greenstick fracture
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an incomplete fracture of cracking of the bone without actual separation of the parts. Common in children
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comminuted fracture
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bone fragments into many pieces
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spiral
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common sports fracture resulting from a twisting force
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The epiphyseal plate is ________.
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where long bone lengthening occurs
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Osteoclasts ________.
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break down bone
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Hematopoiesis is a term for which of the following physiological processes?
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blood cell formation
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osteoporosis
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bones are porous and thin but bone composition is normal
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osteomalacia
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bone formed is poorly mineralized and soft. Deforms on weight bearing
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Paget's disease
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abnormal bone formation and reabsorption
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Which bone cells form bone?
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osteoblasts
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Normal bone formation and growth are dependent on the adequate intake of ________.
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calcium, phosphate, and vitamin D
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What tissue forms the model for endochondral ossification?
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cartilage
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Which of the following is the single most important stimulus for epiphyseal plate activity during infancy and childhood?
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growth hormone
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The notable hardness of bone is attributed to ________.
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the presence of inorganic hydroxyapatites
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The correct order (from start to finish) of fracture repair is ________.
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hematoma formation fibrocartilaginous callus formation bony callus formation bone remodeling
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Choose the TRUE statement. Endochondral ossification leads to the formation of the clavicles and cranial bones. Most bones in the body are formed by intramembranous ossification. Endochondral ossification occurs within fibrous connective tissue membranes. Endochondral ossification converts hyaline cartilage "bone" models into true bones (i.e., hyaline cartilage serves as a template for bone formation).
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Endochondral ossification converts hyaline cartilage "bone" models into true bones (i.e., hyaline cartilage serves as a template for bone formation).
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Which of the following is a bone projection?
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trochanter
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The illustrated bone-forming process would be associated with which of the following bones?
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parietal
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How can a tooth be moved in a bony socket during orthodontic treatment?
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By applying slight pressure to a tooth, the bone on the forward side will reabsorb, while the bone on the reverse side will be reformed.
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Growth of bones is controlled by a symphony of hormones. Which hormone is of greatest importance for bone growth during infancy and childhood?
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growth hormone
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endosteum
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the lining of the marrow cavity
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osteoclasts
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cells that can dissolve the bony matrix
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lamellae
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layers of bone matrix
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canaliculi
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small channels that radiate through the matrix of bone
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osteoblasts
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cells that can build bony matrix
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Which of the following is UNLIKELY to affect bone remodeling?
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glucagon
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Why, or why not, is swimming recommended as an exercise to prevent osteoporosis?
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Swimming is not recommended to prevent osteoporosis, as it is not considered a weight-bearing exercise.
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Lengthwise, long bone growth during infancy and youth is exclusively through ________.
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interstitial growth of the epiphyseal plates
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Osteomyelitis is ________.
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due to pus-forming bacteria
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In some cases the epiphyseal plate of the long bones of children closes too early. What might be the cause?
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elevated levels of sex hormones
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What event precedes the step in the bone-forming process shown in the figure?
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calcification of the cartilage matrix
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Choose the CORRECT pairing. paget's disease: excessive and haphazard bone deposition and resorption osteomalacia: excessive mineralization of the bone rickets: deficiency of vitamin A osteoporosis: increased bone density
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paget's disease: excessive and haphazard bone deposition and resorption
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The structural unit of cancellous bone tissue is called ________.
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trabeculae Spongy bone
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Which of the following glands or organs produces hormones that tend to decrease blood calcium levels?
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thyroid
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Cartilage grows in two ways, appositional and interstitial. What is appositional growth?
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the secretion of new matrix against the external face of existing cartilage
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The structure of bone tissue suits the function. Which of the following bone tissues is adapted to support weight and withstand tension stress?
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compact bone
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When should prevention of osteoporosis start?
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The prevention of osteoporosis should begin with children while bones are still growing. Children should increase their bone mass to provide additional protection from osteoporosis in the future.
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The above figure depicts which of the following bone-forming processes?
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intramembranous ossification during embryonic development
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The resilience of bone is primarily due to which of the following?
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sacrificial bonds in or between collagen molecules
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The canal that runs through the core of each osteon (the Haversian canal) is the site of ________.
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blood vessels and nerve fibers
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What is osteoid?
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the organic part of the matrix of bone composed of proteoglycans and glycoproteins, and collagen fibers.
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Which of the following statements best describes interstitial growth?
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Chondrocytes in the lacunae divide and secrete matrix, allowing the cartilage to grow from within.
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For intramembranous ossification to take place, which of the following is necessary?
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An ossification center forms in the fibrous connective tissue.
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The structures in the figure collectively form a structural unit termed a(n) ______.
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osteon The circular structural unit found within compact bone is termed the osteon.
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Yellow bone marrow contains a large percentage of ________.
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fat
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Ossification of the ends of long bones ________.
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is produced by secondary ossification centers
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During infancy and childhood, the most important stimulus of epiphyseal plate activity is ________.
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growth hormone
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What controls bone remodeling?
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mechanical stress and hormones
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What is the final stage in the healing of a bone fracture?
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bone remodeling
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Osteogenesis is the process of ________.
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bone formation
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In the epiphyseal plate, cartilage grows ________.
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by pushing the epiphysis away from the diaphysis
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The term diploë refers to the ________.
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internal layer of spongy bone in flat bones
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Hematopoiesis refers to the formation of blood cells within the red marrow cavities of certain bones.
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True
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Which structure allows the diaphysis of the bone to increase in length until early childhood, as well as shaping the articular surfaces?
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epiphyseal plate
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In adults, yellow marrow is located ________.
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in the medullary cavity of long bones
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Choose the FALSE statement. The sternum is an example of a flat bone. Irregular bones include the vertebrae and hip bones. Sesamoid bones form within certain tendons. Long bones include all limb bones except the patella
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Long bones include all limb bones except the patella.
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Bones do NOT have a role in ________.
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glycogen production it takes place primarily in muscle and liver cells.
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Hyaline cartilage ________.
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is found on the ends of bones that form movable joints
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Which of the following is the major component of the part of the bone labeled E?
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adipose tissue Yellow bone marrow within the medullary cavity is composed primarily of adipose tissue (fat).
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What type of bone is the patella?
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sesamoid bone
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What is the structural unit of compact bone?
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the osteon
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chondrocytes
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the cells responsible for the early stages of endochondral ossification
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appositional growth
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the growth pattern of bone in which matricx is laid down on the surface
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diaphysis
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the area of long bones where cartilage cells are replaced by bone cells
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epiphyseal line
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the appearance of this structure signals the end of bone growth
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epiphyseal plate
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area where bone longitudinal growth takes place
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Which of the following is CORRECTLY matched? incomplete fracture: the bone is broken through linear fracture: the break is perpendicular to the bone's long axis nondisplaced fracture: the fractured bone ends are misaligned compound fracture: the fractured bone ends penetrate the skin
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compound fracture: the fractured bone ends penetrate the skin
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Osteocytes are connected to each other through which structure?
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canaliculi
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Which hormone increases osteoclast activity to release more calcium ions into the bloodstream?
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parathyroid hormone
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