Answer: Reabsorption.
- A Micturition
- B Reabsorption
- C Secretion
- D Filtration
Correct answer: B. Reabsorption
Explanation: Reabsorption is the process, mainly occurring in the proximal convoluted tubule, by which useful substances such as glucose, amino acids, and water are returned from the filtrate to the blood.
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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