The Question is from neet-zoology excretory-products-and-their-elimination function-of-the-tubules, and it was created by the author A SUBRAMANYAM

Question

Which hormone primarily regulates water reabsorption in the collecting duct?

A SUBRAMANYAM · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Renal physiology, hormonal regulation of fluid balance
 **Related Topics**:  ADH mechanism of action, collecting duct function, osmoregulation
 **Prerequisites**: Understanding of kidney structure and function, basic endocrinology
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the primary hormone regulating water reabsorption in the collecting duct.
  Options include Aldosterone, Antidiuretic hormone (ADH), Atrial natriuretic peptide (ANP), and Renin.
**Method & Steps**:
 1. Identify the hormone responsible for water reabsorption in the collecting duct.
  Reasoning: The collecting duct is the final site of urine concentration.  Hormonal control is crucial for fine-tuning water excretion to maintain fluid balance.
  Formula/Rule:  No specific formula is needed, but understanding the role of each hormone is crucial.
 2. Analyze the function of each hormone.
  Working: 
            * Aldosterone primarily regulates sodium and potassium reabsorption, indirectly influencing water balance.
            * Antidiuretic hormone (ADH) increases water permeability in the collecting duct, leading to increased water reabsorption.
            * Atrial natriuretic peptide (ANP) promotes sodium and water excretion, opposite to water reabsorption.
            * Renin is an enzyme initiating the renin-angiotensin-aldosterone system, indirectly affecting sodium and water balance.
  Key Point: ADH is the primary hormone directly influencing water permeability in the collecting duct.
 3. Determine the primary hormone for water reabsorption.
  Result: Antidiuretic hormone (ADH) is the primary hormone that regulates water reabsorption in the collecting duct.
  Verification: The physiological effects of ADH on the collecting duct support this conclusion.
 ## OPTION ANALYSIS
A :x: Aldosterone primarily regulates sodium and potassium balance, not directly water reabsorption in the collecting duct, though it indirectly influences water reabsorption by affecting sodium.
B ✓: Antidiuretic hormone (ADH) directly increases water permeability in the collecting duct, leading to increased water reabsorption.  This is the primary mechanism for regulating water balance in this segment of the nephron.
C :x: Atrial natriuretic peptide (ANP) has the opposite effect; it promotes sodium and water excretion.
D :x: Renin initiates the renin-angiotensin-aldosterone system, which indirectly influences sodium and water balance, but it is not the primary regulator of water reabsorption in the collecting duct.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the roles of ADH and aldosterone: Remember that ADH acts directly on water permeability, while aldosterone acts primarily on sodium.
  2.Overlooking the indirect effects of hormones:  Many hormones influence water balance indirectly.
 **Quick Tips**:
  1.Focus on the direct action of hormones on the collecting duct.
  2.Remember the mnemonic “ADH = Anti-Diuresis Hormone” (meaning it reduces urine production).

A SUBRAMANYAM · Answer

Aldosterone

A SUBRAMANYAM · Answer

The correct Option is "Antidiuretic hormone (ADH)"

A SUBRAMANYAM · Answer

Atrial natriuretic peptide (ANP)

A SUBRAMANYAM · Answer

Renin

NEET Zoology Excretory Products And Their Elimination Function Of The Tubules MCQs

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