Answer: reabsorbed.
- A reabsorbed
- B filtered out
- C secreted
- D digested
Correct answer: A. reabsorbed
Explanation: All the filtered glucose is reabsorbed in the proximal tubule, so none reaches the urine.
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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