Answer: Proximal convoluted tubule.
- A Distal convoluted tubule
- B Loop of Henle
- C Collecting duct
- D Proximal convoluted tubule
Correct answer: D. Proximal convoluted tubule
Explanation: The proximal convoluted tubule (PCT) reabsorbs almost all of the filtered glucose and amino acids, along with most Na+, K+ and water.
Filtrate flows through four functionally distinct stages of the nephron: Bowman's capsule filters blood, the PCT reabsorbs most useful substances unconditionally, the Loop of Henle builds a concentration gradient via counter-current exchange, the DCT secretes selected substances, and the collecting duct performs the final ADH-controlled water reabsorption.
Concept context
Nitrogenous waste, kidney structure, urine formation in the nephron, and hormonal regulation of excretion.
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