Q145
neet_2026_03_may_morning
Regulation of Kidney Function
Arrange the following events occurring in Renin-Angiotensin mechanism in the correct order:
A. Increase in blood pressure and Glomerular filtration rate
B. Reabsorption of Na⁺ and water from distal parts of tubule due to Aldosterone
C. Fall in Glomerular filtration rate
D. Vasoconstriction by Angiotensin II and release of Aldosterone.
E. Renin converts Angiotensinogen into Angiotensin I, followed by Angiotensin II.
Choose the correct answer from the options given below:
Solution
Core Logic
The Renin-Angiotensin-Aldosterone System (RAAS) operates in this specific chronological order:
- A fall in glomerular blood flow/glomerular blood pressure/GFR (C) activates the JG cells.
- JG cells release Renin, which converts the plasma protein Angiotensinogen into Angiotensin I, and further into Angiotensin II (E).
- Angiotensin II acts as a powerful vasoconstrictor and also activates the adrenal cortex to release Aldosterone (D).
- Aldosterone causes active reabsorption of Na⁺ and water from the distal parts of the tubule (B).
- This reabsorption leads to an increase in blood pressure and consequently increases the GFR back to normal (A).
Step 1: Final Conclusion
The correct sequence is C → E → D → B → A.
Pattern Recognition
The trigger is always a 'Fall in GFR' (C). The final result is always an 'Increase in BP and GFR' (A). The sequence must start with C and end with A. Only one option follows this structure perfectly.
Chapter Mix
Class 11 Biology: Excretory Products and their Elimination Class 11 Biology: Chemical Coordination and Integration
