Vasodialtor in the following

Options

A. ADH
B. Angiotensin
C. ANF
D. Both (1) and (2)

Answer

To determine which of the given hormones acts as a vasodilator, we need to analyze each option carefully.

### Step-by-Step Solution:

1. **Understand the Definition of Vasodilator**:
- A vasodilator is a substance that causes blood vessels to widen (dilate), which decreases blood pressure and increases blood flow.

2. **Evaluate ADH (Antidiuretic Hormone)**:
- ADH, also known as vasopressin, primarily functions to promote water reabsorption in the kidneys.
- It does not cause vasodilation; instead, it can lead to vasoconstriction in certain contexts.
- **Conclusion**: ADH is not a vasodilator.

3. **Evaluate Angiotensin**:
- Angiotensin is produced from the conversion of angiotensinogen by renin.
- Angiotensin II, the active form, is known to be a powerful vasoconstrictor, meaning it narrows blood vessels.
- **Conclusion**: Angiotensin is not a vasodilator.

4. **Evaluate ANF (Atrial Natriuretic Factor)**:
- ANF is released from the atria of the heart and is known to promote vasodilation.
- It works to decrease blood pressure by relaxing blood vessels and promoting the excretion of sodium and water.
- **Conclusion**: ANF is a vasodilator.

5. **Final Answer**:
- Based on the evaluations, the correct option for the vasodilator among the given hormones is **ANF (Atrial Natriuretic Factor)**.

### Summary:
- ADH: Not a vasodilator (promotes water reabsorption).
- Angiotensin: Not a vasodilator (powerful vasoconstrictor).
- ANF: Vasodilator (causes dilation of blood vessels and decreases blood pressure).