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NCLEX Question of the Day
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Where within the nephron is the most important portion that controls potassium homeostasis?
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The loop of Henle
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The glomerulus
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Correct answer The distal tubule
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The proximal tubule
Rationale
The distal tubule of the nephron plays a crucial role in potassium homeostasis. It is here that the fine-tuning of potassium secretion occurs, primarily under the influence of the hormone aldosterone. When the body needs to conserve potassium, aldosterone secretion is reduced, and the distal tubule reabsorbs more potassium. Conversely, when the body needs to excrete more potassium, aldosterone secretion is increased, and the distal tubule secretes more potassium into the urine.
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