The anatomy class is learning about the countercurrent mechanism in the medullary nephrons. What would the students learn about this mechanism and what it acts to do?
A) Promote sodium excretion
B) Concentrate or dilute the urine
C) Block the effects of aldosterone
D) Stimulate antidiuretic hormone (ADH) release
B
Feedback:
The countercurrent mechanism in the medullary nephrons acts to concentrate or dilute urine. It does not promote sodium excretion nor does it block the effects of aldosterone. This mechanism does not stimulate ADH release.
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