Chapter 7 Questions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Explain how the development of intramembranous bone differs from that of endochondral bone. (204) | intramembranous are bones that originate within sheetlike layers of connective tissues; endochonral bones begin as masses of cartilage and later is replaced by bone tissue
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| Explain how osteoblasts and osteoclasts regulate bone mass. (208) | osteoclasts remove the calcified matrix around the cartilage then osteoblasts invade the region and deposit bone tissue in place of the the cartilage
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| Explain the mechanism that regulates the concentration of blood calcium ions. (211) | when calcium is low, parathyroid hormone stimulates osetoclasts to break down bone which releases calcium into the blood
when calcium is high, calcitonin activates osteoblasts to form bone tissue, storing calcium in the matrix
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| Bones of the head, neck, and trunk compose the _________ skeleton; bones of the limbs and their attachments compose the _________ skeleton. (214) | axial; appendicular
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| Explain the importance of fontanels. (226) | fontanels allow the head to change shape so the head can pass through the birth canal
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| Describe a typical vertebra, and distinguish among the cervical, thoracic, and lumbar vertebrae. (228) | cervical- spinous processes, axis and atlas
thoracic-processes project at sharp angles, articulate with ribs
lumbar-processes project laterally, short thick processes
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| Name the bones of the upper limb, and describe their locations. (236) | humerus, ulna, radius, carpals, metacarpals, phalanges
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| Explain the major differences between the male and female skeletons. (242) | males have larger, heavier skulls while female skulls are saller and more delicate
males have heavier, thicker pelvieses while females have lighter pelvises with wider pubic arches for child birth
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