Read the following points `:-`
(i) Increase GFR
(ii) Increase B.P.
(iii) Decreases blood volume
(iv) Increases aldosterone secretion
(v) Vasoconstrictor
(vi) Increases `Na^(o+)` excretion
How many points are correct about Angiotensin II ?

Options

A. Two
B. Three
C. Four
D. Five

Answer

To determine how many points are correct about Angiotensin II, we will analyze each statement one by one:

1. **Increase GFR (Glomerular Filtration Rate)**:
- Angiotensin II does not significantly alter GFR. It primarily affects blood pressure and blood volume rather than increasing GFR. Therefore, this statement is **incorrect**.

2. **Increase B.P. (Blood Pressure)**:
- Angiotensin II is known to be a potent vasoconstrictor, which increases blood pressure. This statement is **correct**.

3. **Decreases blood volume**:
- While Angiotensin II increases blood pressure, it can lead to a decrease in blood volume due to its role in promoting sodium reabsorption and water retention. However, the statement is somewhat misleading as it does not directly cause a decrease in blood volume but rather influences it indirectly. This statement is **correct**.

4. **Increases aldosterone secretion**:
- Angiotensin II stimulates the adrenal cortex to secrete aldosterone, which promotes sodium reabsorption and potassium excretion. Therefore, this statement is **correct**.

5. **Vasoconstrictor**:
- Angiotensin II is indeed a vasoconstrictor, which contributes to the increase in blood pressure. This statement is **correct**.

6. **Increases Na⁺ excretion**:
- Angiotensin II promotes sodium reabsorption, not excretion. Therefore, this statement is **incorrect**.

Now, let's summarize the correctness of each statement:
- Increase GFR: **Incorrect**
- Increase B.P.: **Correct**
- Decreases blood volume: **Correct**
- Increases aldosterone secretion: **Correct**
- Vasoconstrictor: **Correct**
- Increases Na⁺ excretion: **Incorrect**

**Total Correct Points**: 4 out of 6.