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.
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.
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