Myxedema commonly occurs in:
a. middle-aged men.
b. children.
c. middle-aged women.
d. older women.
c. middle-aged women.
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The principal role of calcium in skeletal muscle contraction is to
a. participate in the propagation of an action potential along the surface of the muscle fiber. b. bind troponin, which in turn permits tropomyosin to uncover the cross-bridge binding site on the thin filament. c. bind tropomyosin, which in turn permits troponin to uncover the cross-bridge binding site on the thin filament. d. activate a calcium-calmodulin-dependent protein kinase, which in turn phosphorylates and activates myosin.
Which structure has fimbriae?
A. Uterus B. Ovary C. Uterine tubes D. Vulva
The falling phase of the action potential is due to
a. calcium influx b. potassium efflux c. chloride influx d. sodium efflux e. the action of Na+-K+ pumps
In young children, hemopoiesis occurs in most of their bones, but in adulthood it primarily occurs in
A. long bones of the hands and feet. B. short bones of the appendicular skeleton. C. the liver and spleen. D. flat bones of the axial skeleton.