Sodium is actively extruded from which part of the nephron?...

Sodium is actively extruded from which part of the nephron?
a. descending portion of the proximal convoluted tubule
b. ascending portion of the loop of the nephron
c. ascending portion of the distal convoluted tubule
d. descending portion of the collecting duct

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Key Concepts

Loop of Henle Function

Within the Loop of Henle, particularly the thick ascending limb, active transport plays a critical role in reabsorbing sodium and other ions from the tubular fluid. This segment is impermeable to water, allowing for the creation of a concentration gradient that is essential for the kidney's ability to concentrate urine.

Nephron Structure

The nephron is the basic functional unit of the kidney, consisting of various segments such as the proximal convoluted tubule, Loop of Henle, distal convoluted tubule, and collecting duct. Each of these segments has specialized functions for reabsorption, secretion, and regulation of electrolytes and water, contributing to overall kidney function.

Active Transport Mechanisms

Active transport refers to the energy-dependent process of moving substances, such as ions like sodium, across cell membranes against their concentration gradient. This mechanism is vital in the kidney for reclaiming essential ions and maintaining electrolyte and fluid balance.

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