Which of the following is not a function of angiotensin ll?

Options

A. Vasoconstriction
B. Increase the glomerular blood pressure
C. Decreases the GFR
D. Increases the blood pressure

Answer

To solve the question "Which of the following is not a function of angiotensin II?", we will analyze the functions of angiotensin II step by step.

### Step 1: Understand Angiotensin II
Angiotensin II is a peptide hormone that plays a crucial role in regulating blood pressure and fluid balance. It is formed from angiotensin I through the action of the enzyme angiotensin-converting enzyme (ACE).

**Hint:** Angiotensin II is primarily known for its role in blood pressure regulation.

### Step 2: Identify Functions of Angiotensin II
The main functions of angiotensin II include:
1. **Vasoconstriction:** Angiotensin II causes blood vessels to constrict, which increases blood pressure.
2. **Increase in Glomerular Blood Pressure:** By promoting vasoconstriction, it helps to increase the pressure in the glomeruli of the kidneys, which is essential for filtration.
3. **Decrease in Glomerular Filtration Rate (GFR):** While angiotensin II can constrict the efferent arterioles of the glomeruli, it can also maintain or increase GFR under certain conditions. However, in general, its vasoconstrictive effects can lead to a decrease in GFR if the constriction is too strong.
4. **Increase in Blood Pressure:** Due to its vasoconstrictive properties, angiotensin II increases systemic blood pressure.

**Hint:** Think about how vasoconstriction affects blood flow and pressure in the body.

### Step 3: Analyze the Options
Now, we need to determine which of the provided options is NOT a function of angiotensin II. The options are:
- A) Vasoconstriction
- B) Increase the glomerular blood pressure
- C) Decrease the GFR
- D) Increase the blood pressure

From our understanding:
- A) Vasoconstriction is a function of angiotensin II.
- B) Increase the glomerular blood pressure is a function of angiotensin II.
- C) Decrease the GFR is somewhat misleading. While angiotensin II can decrease GFR under certain conditions, it primarily serves to maintain or increase GFR in response to low blood pressure.
- D) Increase the blood pressure is a function of angiotensin II.

**Hint:** Consider the overall effect of angiotensin II on kidney function and blood pressure.

### Step 4: Conclusion
The option that is NOT a function of angiotensin II is **C) Decrease the GFR**. While angiotensin II can influence GFR, its primary role is to maintain or increase it, especially in response to low blood pressure.

**Final Answer:** C) Decrease the GFR