Most transmembrane proteins have ________ regions facing the intra- and extracellular fluid, and ________ regions embedded in the phospholipid bilayer
A) hydrophobic; hydrophilic
B) lipophilic; lipophobic
C) hydrophilic; hydrophilic
D) hydrophobic; hydrophobic
E) hydrophilic; hydrophobic
E
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Granular cells synthesize and release the enzyme
A. antidiuretic hormone. B. calcitriol. C. angiotensinogen. D. renin.
The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called
A. cell bodies of neurons. B. Z disks. C. myofilaments. D. sarcomeres. E. neuromuscular junctions.
In a taste bud, which cell produces a receptor potential?
A. Basal cells B. Sensory nerve fibers C. Supporting cells D. Taste cells E. Taste hairs
Which structure is not supplied by postganglionic fibers that originate in the celiac ganglion?
A. Liver B. Pancreas C. Small intestine D. Stomach E. Spleen