A muscle that constricts an opening is a(n) ________.
A. antagonist
B. sphincter
C. extensor
D. levator
Answer: B
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Which statement is true regarding calcium in bone matrix?
A) Calcium is found in crystals called hydroxyapatite. B) Calcium is secreted by osteoblasts into the matrix. C) Once deposited, calcium cannot be removed from bone. D) Calcium provides flexibility to the bone matrix. E) Calcium is the organic part of the matrix.
During a choking episode, most foreign objects are lodged in the ________ bronchus due to its larger diameter and steeper angle
A) right primary B) left primary C) right lobar D) left lobar E) medial
A megakaryoblast will develop into
a) a red blood cell. b) a white blood cell. c) a platelet. d) either a white blood cell or a platelet. e) none of these choices.
The visceral pleura
A. is attached to the lung's surface. B. lines the thoracic cavity. C. is a mucous membrane. D. All apply.