Hypertension may be caused by all of these except
a. renal disease.
b. hardening of the arteries.
c. suppression of baroreceptors.
d. salt imbalances.
e. adrenal medullary tumors.
C
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Epithelial cells are continually being shed from the villi because
a. the intracellular enzymes digest important cellular constituents, causing the cells to disintegrate and slough. b. the body needs a continual supply of protein derived from the digestion of these cells. c. new cells are continually being produced in the crypts at the base of the villi and migrate upward. d. acid entering the small intestine from the stomach constantly destroys the small intestinal lining, causing the cells to slough. e. none of these answers.
Summation events result from increasing amounts of cytoplasmic calcium levels
Indicate whether the statement is true or false
Which of the following is NOT an action needed for glutamate to open ion channels?
A. NMDA receptor must bind to glycine. B. Mg2+ is released from NMDA channel to open it. C. Cl- must pass through the open channel. D. The membrane must be partially depolarized from the action of a different neurotransmitter.
Unlike children, if a positive nitrogen balance is found in an adult, it is an indication that body tissues are being metabolized for energy.
Answer the following statement true (T) or false (F)