The substance that an enzyme acts upon is its
A. active site.
B. product.
C. catalyst.
D. substrate.
Answer: D
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Nicotinic receptors
A) respond to epinephrine. B) respond to norepinephrine. C) open chemically-gated sodium ion channels. D) can be either excitatory or inhibitory in function. E) are found at synaptic junctions of the sympathetic nervous system.
In the following left lateral view of an aortic angiogram, the arrow points to the:
A) right coronary artery. B) circumflex artery. C) posterior interventricular artery. D) artery to the SA node. E) coronary sinus.
Within the kidneys, what membrane has microvilli?
A) glomerulus B) basolateral membrane of renal tubule epithelial cells C) apical membrane of renal tubule epithelial cells D) basolateral membrane of peritubular capillary endothelial cells E) apical membrane of vasa recta endothelial cells
Within the central nervous system, the myelin sheath is produced from
A. Schwann cells. B. oligodendrocytes. C. neurolemmocytes. D. All apply.