The proportion of collagen to hydroxyapatite in bone determines the
A. thickness of the bone.
B. strength of the bone.
C. growth rate of bone.
D. ability of the bone to heal.
E. length of the bone.
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Question 2) The primary mineral in bone is
A. iron.
B. sodium.
C. potassium.
D. calcium.
E. oxygen.
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Question 3) The cell type that is responsible for maintaining bone once it has been formed is the
A. osteocyte.
B. chondrocyte.
C. osteoblast.
D. osteoclast.
E. chondroblast.
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Question 4) The compression (weight-bearing) strength of bone matrix is due to the presence of
A. hydroxyapatite crystals.
B. collagenase.
C. collagen fibers.
D. elastin fibers.
E. bone marrow.
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Question 5) Which of the following occurs in the formation of mineralized bone matrix?
A. Blood calcium is elevated.
B. Hydrogen ions form an acid environment in bone matrix.
C. Ca2+ is actively transported from bone matrix to the blood.
D. The protein components of bone matrix are digested.
E. Osteoblasts form collagen and proteoglycans.
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Question 6) Rickets is
A. bone inflammation that often results from bacterial infection.
B. a group of genetic disorders producing very brittle bones that are easily fractured; occurs because of insufficient collagen development.
C. a disease in children characterized by soft, bowed, and swollen bones.
D. a disease in adults, especially women, characterized by a reduced amount of bone matrix.
E. a disease in adults characterized by softening of bones resulting from calcium depletion.
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Question 7) Osteogenesis imperfecta can be caused by abnormally formed
A. hydroxyapatite.
B. proteoglycans.
C. collagen.
D. osteoblasts.
E. calcium.
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Question 8) Brittle bone disorder is another name for
A. scurvy.
B. osteomyelitis.
C. osteoporosis.
D. osteomalacia.
E. osteogenesis imperfecta.
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Question 9) Collagen and calcium hydroxyapatite are the primary constituents of
A. bone matrix.
B. blood.
C. fibrous cartilage.
D. hyaline cartilage.
E. ligaments.
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Question 10) In appositional growth of cartilage,
A. new chondrocytes and new matrix are added on the outside of the tissue.
B. the tissue becomes vascularized in order to grow.
C. chondroblasts within the tissue proliferate and add more matrix from the inside.
D. the cartilage is replaced with another kind of connective tissue.
E. osteoblasts replace the chondroblasts.
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