Question

Under normal conditions, about ____ percent of filtered Na+ and CI- is reabsorbed in the proximal tubule.

A. 25
B. 45
C. 55
D. 65

Answer 1

Under normal conditions, about 67 percent of filtered Na+ and Cl- is reabsorbed in the proximal tubule.

Step-by-step explanation:

The question refers to the percentage of sodium (Na+) and chloride (Cl-) that is reabsorbed in the proximal tubule of the nephron under normal conditions. About 67 percent of the water, Na+, and Cl- entering the nephron is reabsorbed in the PCT (proximal convoluted tubule) and returned to the circulation. This is part of the kidney's process to recover a vast majority of solutes and water back into the body to maintain fluid and electrolyte balance.