Bone mass reduction is promoted by which hormone?
a) calcitriol
b) calcitonin
c) human growth hormone
d) parathyroid hormone
e) insulin
d
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The physiological significance of mitochondrial cristae is they
a. provide more surface area across which electrons can be transported. b. provide a histological cue to enable organelle identification. c. decrease the volume of the matrix, thereby increasing the concentration of its components. d. decrease the volume of the matrix, allowing cells to economize on the production of its components. e. None of these.
Calsequestrin in cardiac muscle:
A. acts as a high affinity Ca++ buffer in the cytosol B. acts as a low affinity Ca++ buffer in the SR lumen, near the ryanodine receptor C. promotes Ca++ accumulation by the mitochondria D. increases the Ca++ affinity of the sarcolemmal Ca++ pump E. facilitates myosin binding to the actin thin filament
Which can be used to characterize blood flow in the human body?a: There is a unidirectional blood flow.b: Arteries always carry oxygenated blood.c: Veins always carry deoxygenated blood.d: Arteries carry blood away from the heart.e: Veins carry blood toward the heart.
A. d, e B. a, d, e C. b, c, d, e D. a, b, c, d, e E. a, c, d, e
Androgens, which are similar to testosterone, are:
a. secreted by the inner zone of the adrenal cortex b. secreted by the middle zone of the adrenal cortex c. secreted by the outer zone of the adrenal cortex d. not secreted by the adrenal cortex