Answer: Afferent arteriole.
- A Renal vein
- B Efferent arteriole
- C Peritubular vein
- D Afferent arteriole
Correct answer: D. Afferent arteriole
Explanation: The afferent arteriole carries blood into the glomerulus; the efferent arteriole carries it away.
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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