A rise in sodium levels and extracellular volume leads to a rise in blood pressure. As a result, ____
a. renin levels rise, but aldosterone levels fall
b. renin levels fall, but angiotensin levels rise
c. renin and aldosterone levels rise
d. renin and aldosterone levels drop
e. renin levels drop, but aldosterone levels remain the same
ANSWER: d
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What systems lend themselves best to the study of environmental factors that lead to the maintenance of sexual reproduction?
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