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Which of the following does not favour the formation of large quantities of dilute urine?

1. Caffeine
2. Renin
3. Atrial-natriuretic factor
4. Alcohol

Correct answer: Renin

Solution

Renin activates the renin-angiotensin-aldosterone system, which increases sodium and water reabsorption, so it reduces urine volume instead of producing lots of dilute urine. Caffeine, atrial-natriuretic factor, and alcohol all tend to increase urine output.

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