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Q141 (IAS/2002) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Human anatomy physiology Answer Verified

Assertion (A) : Drinking of whisky increases the frequency of urination. Reason (R) : Alcohol intake speeds up the secretion of vasopressin in the body.

Result
Your answer: —  Â·  Correct: C
Explanation

Assertion is true: intake of whisky (ethanol) produces a diuretic effect and commonly increases urinary frequency because alcohol promotes water loss through the kidneys [1]. Reason is false: alcohol does not speed up vasopressin (antidiuretic hormone) secretion — it suppresses ADH/vasopressin release. This inhibition of vasopressin reduces water reabsorption in renal collecting ducts and causes increased urine output (diuresis), which explains the increased urination after drinking [2]. Thus the observed diuresis is due to reduced vasopressin action, not an increase in its secretion; R is therefore incorrect as an explanation of A.

Sources

  1. [1] https://downloads.regulations.gov/EPA-HQ-OLEM-2018-0830-0009/content.pdf
  2. [2] http://www.jci.org/articles/view/106633/files/pdf
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