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The adrenal cortex produces mineralocorticoids such as aldosterone, which enhance sodium and water reabsorption in the kidney tubules, thereby reducing excessive urine production. What effect does aldosterone have on sodium reabsorption?

1. Aldosterone enhances sodium reabsorption.
2. Aldosterone reduces sodium reabsorption.
3. Aldosterone promotes sodium excretion.
4. Aldosterone minimizes sodium excretion.

Correct answer: Aldosterone enhances sodium reabsorption.

Solution

Aldosterone is a mineralocorticoid that increases the reabsorption of sodium (Na+) from the renal tubules, which helps in water retention and prevents diuresis.

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