Q145 (2024)
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:
- C, A, B, D, E
- A, D, B, E, C
- A, C, E, B, D
- C, E, D, B, A
### Related Formula
$\text{Fall in GFR} \rightarrow \text{Renin release} \rightarrow \text{Angiotensinogen} \rightarrow \text{Angiotensin I} \rightarrow \text{Angiotensin II} \rightarrow \text{Aldosterone} \rightarrow \text{Increased GFR}$
### Core Logic
The step-by-step sequence of the RAAS mechanism is:
1. Fall in glomerular filtration rate (GFR) / blood flow (C)
2. JG cells release Renin, converting Angiotensinogen to Angiotensin I and then to Angiotensin II (E)
3. Angiotensin II causes vasoconstriction and stimulates adrenal cortex to release Aldosterone (D)
4. Aldosterone causes reabsorption of $Na^+$ and $H_2O$ from DCT (B)
5. Increase in blood pressure and GFR back to normal (A)
### Step 1: Sequence Order
The correct order is C $\rightarrow$ E $\rightarrow$ D $\rightarrow$ B $\rightarrow$ A.
### Pattern Recognition
Sees: "Renin-Angiotensin mechanism order".
Shortcut: Starts with Fall in GFR (C) and ends with Increase in BP/GFR (A).
### Evaluation Rubric / Model Answer
null
### Chapter Mix
Class 11 Biology: Excretory Products and Their Elimination
