Select the correct statement :

Options

A. Argiotensin II is a powerful vasodilator .
B. Counter current pattern of blood flow is not observed in was recta .
C. Reduction in Glomerular Filtration Rate activates JG cells to renin ,
D. Atrial Natriuretic Factor increases the blood pressure .

Answer

To solve the question of selecting the correct statement regarding excretory products and their elimination, we will analyze each option provided in the video transcript step by step.

### Step-by-Step Solution:

1. **Analyze Statement 1: Angiotensin 2 is a powerful vasodilator.**
- Angiotensin 2 is actually a vasoconstrictor, meaning it constricts blood vessels, which increases blood pressure. Therefore, this statement is **incorrect**.

2. **Analyze Statement 2: Counter current pattern is not observed in vasa recta.**
- The counter current mechanism is indeed observed in the vasa recta, which allows for the efficient exchange of substances. Therefore, this statement is **incorrect**.

3. **Analyze Statement 3: Reduction in Glomerulus Filtration Rate.**
- This statement is correct. When blood pressure decreases, the Renin-Angiotensin System (RAS) is activated, leading to increased water reabsorption and normalization of blood pressure. Thus, this statement is **correct**.

4. **Analyze Statement 4: Atrial natriuretic factor increases blood pressure.**
- Atrial natriuretic factor (ANF) actually decreases blood pressure by promoting sodium excretion and reducing blood volume. Therefore, this statement is **incorrect**.

### Conclusion:
The correct statement is **Statement 3: Reduction in Glomerulus Filtration Rate**.