Question
Which of the following does not favour the formation of large quantities of dilute urine?
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Alcohol
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Caffeine
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Renin
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Atrial-natriuretic factor
Solution
C.
Renin
Renin secreted by JGA regulates the glomerular filtration rate by inducing multihormonal system i.e. RAAS (Renin Angiotensin - Aldosterone System). Activation of this system increase the reabsorption rate of sodium (Na+) and water, making the urine more concentrated.
Alcohol decreases vasopressin level which lowers reabsorption of water thus making urine more dilute. ANF causes vasodilation and acts as check on RAAS
