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Answer : 1 Aldosterone increases sodium reabsorption by increasing the number of Na -K ATPase pumps in the luminal membrane of the proximal tubule. Explanation : Answer: A) Aldosterone increases sodium reabsorption by increasing the number of Na -K ATPase pumps in the luminal membrane of the proximal tubule. Explanation: Aldosterone, the main mineralocorticoid hormone, is a steroid hormone produced by the zona glomerulosa of the adrenal cortex in the adrenal gland. It is essential for sodium conservation in the kidney, salivary glands, sweat glands and colon.

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