During the cephalic phase of gastric secretion,
A) the stomach responds to distention.
B) secretin inhibits parietal and chief cells.
C) the vagus nerve innervates the stomach.
D) the intestinal reflex inhibits gastric emptying.
E) production of gastric juice slows down.
Answer: C
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Which of the following is an accessory structure of the integument?
A) ear lobe B) gums C) sebaceous glands D) endocrine glands E) teeth
Glucose is usually completely reabsorbed from the filtrate by the time the filtrate has reached the
A. tip of the loop of Henle. B. end of the collecting duct. C. end of the distal convoluted tubule. D. end of the proximal convoluted tubule. E. beginning of the proximal convoluted tubule.
Which statement about precapillary sphincters is CORRECT?
A. They are openings that allow large molecules and blood cells to leave the capillary. B. They are voluntary. C. They can close off the capillaries by contracting. D. They contract when oxygen levels in the tissue are low. E. When the precapillary sphincters are open, blood flows only through the thoroughfare channels.
Essential amino acids are so physiologically important that the body can synthesize them by modifying other (nonessential) amino acids.
Answer the following statement true (T) or false (F)