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Which of the following statements regarding PTH (parathyroid hormone) is true?


A) PTH causes decreased uptake of Ca2+ from the small intestine.
B) PTH causes decreased vitamin D formation in the kidneys.
C) PTH causes increased reabsorption of Ca2+ in the kidneys.
D) PTH causes increased loss of Ca2+ from the kidneys.
E) PTH causes increased Na+ reabsorption in the kidneys.

F) B) and D)
G) A) and B)

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An x-ray determines that Peter fractured the shaft of his humerus. The break is in the ________ of the bone.


A) epiphysis
B) epiphyseal line
C) diaphysis
D) growth plate
E) articular surface

F) B) and E)
G) A) and B)

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A connective tissue sheath around cartilage is the ________.


A) endosteum
B) perichondrium
C) periosteum
D) epiphyseal line
E) ligament

F) A) and B)
G) A) and C)

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  -This figure illustrates bone growth in length at the epiphyseal plate. Zone  A  represents A)  bone tissue of the diaphysis. B)  the zone of calcification. C)  the zone of hypertrophy. D)  the zone of proliferation. E)  the zone of resting cartilage. -This figure illustrates bone growth in length at the epiphyseal plate. Zone "A" represents


A) bone tissue of the diaphysis.
B) the zone of calcification.
C) the zone of hypertrophy.
D) the zone of proliferation.
E) the zone of resting cartilage.

F) None of the above
G) A) and E)

Correct Answer

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The growth spurt seen in puberty is triggered by ________.


A) parathyroid hormone
B) sex hormones
C) growth hormone
D) thyroid hormone
E) calcitonin

F) C) and E)
G) D) and E)

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The epiphysis of the clavicle is formed by ________ ossification.


A) endochondral
B) intramembranous

C) A) and B)
D) undefined

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During development, some bones arise from thick connective tissue membranes in a process known as ________ ossification, and other bones arise from a hyaline cartilage model in a process known as ________ ossification.


A) endochondral; intramembranous
B) intramembranous; endochondral

C) A) and B)
D) undefined

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A young woman is in a car accident. When she regains consciousness, she notices a sharp pain in her left arm. Looking down, she sees a bone sticking out. This is a open (compound) fracture.

A) True
B) False

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The locations where ossification begin in intramembranous ossification are known as


A) secondary ossification centers.
B) membranous ossification centers.
C) centers of ossification.
D) medullary cavity ossification centers.
E) epiphyseal ossification centers.

F) All of the above
G) A) and D)

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Which effect can be attributed to increased pressure on a bone?


A) Increased osteoblast activity
B) Increased osteoclast activity

C) A) and B)
D) undefined

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It is possible to determine if a child's long bone is growing by examining a radiograph of the ________.


A) diaphysis
B) medullary cavity
C) epiphyseal plate
D) articular cartilage

E) A) and B)
F) None of the above

Correct Answer

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When blood calcium levels are low


A) ostoclast activity increases.
B) calcitonin secretion increases.
C) calcium absorption is reduced.
D) bones produce more bone tissue.
E) osteoblast activity increases.

F) B) and D)
G) A) and D)

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The ethmoid and sphenoid bones are formed by ________ ossification.


A) endochondral
B) intramembranous

C) A) and B)
D) undefined

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Which type of bone cell lies in a lacuna?


A) Osteochondral progenitor cell
B) Osteoblast
C) Osteocyte
D) Osteoclast

E) None of the above
F) B) and C)

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Appositional growth deposits a new layer of bone tissue


A) on the surface of the bone.
B) in the epiphyseal plate of long bones.
C) in the secondary ossification center of the epiphyses.
D) in interstitial areas.
E) on spongy bone, but not compact bone.

F) D) and E)
G) A) and D)

Correct Answer

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Which of the following is associated with osteoclast reabsorption of bone?


A) Hydrogen ions form an acid environment in bone matrix.
B) Osteoblasts form collagen and proteoglycans.
C) The protein components of bone matrix are synthesized.
D) Calcium ions are actively transported from blood to bone matrix.
E) Blood calcium is decreased.

F) A) and E)
G) B) and D)

Correct Answer

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  -This figure illustrates bone growth in length at the epiphyseal plate. Zone  B  represents A)  bone tissue of the diaphysis. B)  zone of calcification. C)  zone of hypertrophy. D)  zone of proliferation. E)  zone of resting cartilage. -This figure illustrates bone growth in length at the epiphyseal plate. Zone "B" represents


A) bone tissue of the diaphysis.
B) zone of calcification.
C) zone of hypertrophy.
D) zone of proliferation.
E) zone of resting cartilage.

F) B) and C)
G) C) and D)

Correct Answer

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Some marrow of long bones is termed "red" marrow. The function of red marrow is to


A) manufacture blood cells.
B) manufacture tissue cells for the skin.
C) store adipose tissue.
D) store bone-forming cells.
E) make vitamin D.

F) None of the above
G) B) and D)

Correct Answer

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Bone formation associated with cartilage is called ________ ossification while bone formed in connective tissue membranes is called ________ ossification.


A) endochondral; intramembranous
B) intramembranous; endochondral
C) woven, spongy
D) spongy, woven

E) C) and D)
F) A) and C)

Correct Answer

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Ossification that involves replacing cartilage with bone is ________.


A) intramembranous
B) endochondral
C) interstitial
D) appositional
E) osteomalacia

F) B) and E)
G) A) and D)

Correct Answer

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