ANF-

A

Decrease B.P.

B

Is secreted when B.P. increases

C

Causes vasodilation

D

All

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### Step-by-Step Text Solution: 1. **Definition of ANF**: ANF stands for Atrial Natriuretic Factor. It is a type of peptide hormone. 2. **Source of ANF**: ANF is secreted from the atrial walls of the heart. This means that when the heart's atria (the upper chambers) are stretched due to increased blood volume, they release ANF. 3. **Function of ANF**: The primary function of ANF is to decrease blood pressure. It does this by promoting vasodilation, which means it relaxes the blood vessels, allowing blood to flow more easily. 4. **Mechanism of Action**: When blood pressure increases, ANF is released to counteract this rise. By dilating blood vessels and promoting the excretion of sodium and water through the kidneys (natriuresis), ANF helps to lower blood volume and subsequently reduce blood pressure. 5. **Conclusion**: Therefore, ANF plays a crucial role in regulating blood pressure and maintaining cardiovascular homeostasis.
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