Regurgitation of food from the stomach into the esophagus:
A. is ordinarily inhibited by the upper esophageal sphincter.
B. causes irritation of the esophageal mucosa.
C. is called retropulsion, and is essential for gastric digestion.
D. is ordinarily prevented by the pyloric sphincter.
E. is called secondary peristalsis.
B
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Enzymes are biological catalysts that are crucial for normal human metabolism
Indicate whether this statement is true or false.
The main way acetylcholine is cleared from a synapse is by
A. degradation by an enzyme. B. uptake by the postsynaptic cell. C. reuptake by the presynaptic cell. D. being engulfed by a supporting glial cell.
35) Your blood glucose level has dropped perilously low because you have been starving yourself for a couple of days to lose weight. Your liver, directed by the hormone insulin, converts its last stored glycogen into glucose to get it out into your bloodstream. In this scenario, the liver is the
A) receptor. B) effector. C) control center. D) feedback. E) balance.
Which cells make androgen binding protein?
a. sperm b. spermatagonia c. theca d. granulosa e. Sertoli