Which brain nucleus is the body's "biological clock"?
A) lentiform nucleus
B) dorsomedial nucleus
C) subthalamic nucleus
D) suprachiasmatic nucleus
D
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Which of the following applies to elastic arteries?
A) They have a poorly defined adventitia. B) The media consists of scattered smooth muscle fibers that do not form a complete layer. C) These vessels distribute blood to the skeletal muscles and internal organs of the body. D) The media of these arteries contains a high density of elastic fibers and relatively few smooth muscle cells. E) None of the answers are correct.
Which of the following substances is most likely to passively diffuse across the plasma membrane by dissolving in the membrane?
a. a cation b. an anion c. a nonpolar or nonionized molecule d. a polar molecule e. a molecule less than 0.8 nm in diameter
Pyruvate dehydrogenase is a multienzyme complex that brings together a molecule of pyruvate and a molecule of coenzyme A.
Answer the following statement true (T) or false (F)
ADH increases the permeability of the distal convoluted tubules and collecting ducts by
A. incorporating aquaporin-3 channels into the apical membrane. B. increasing the number of sodium transpot proteins in the membranes. C. incorporating aquaporin-2 channels into the apical membrane. D. decreasing the number of aquaporin-4 channels in the apical membrane.