ANF (Atrial Natriuretic Factor) is secreted by

Options

A. Heart
B. Brain
C. Kidney
D. Pancreas

Answer

**Step-by-Step Solution:**

1. **Identify the Hormone**: The question asks about Atrial Natriuretic Factor (ANF). It is important to recognize that ANF is a hormone involved in the regulation of blood pressure and fluid balance.

2. **Understand the Source of ANF**: ANF is secreted by the atria of the heart. The term "atrial" in Atrial Natriuretic Factor indicates its origin.

3. **Conditions for Secretion**: ANF is secreted when there is an increase in blood pressure or blood volume. This is a response to the body's need to regulate these parameters.

4. **Function of ANF**: Once secreted, ANF acts to inhibit the renin-angiotensin-aldosterone system (RAAS), which normally promotes sodium and water reabsorption. By inhibiting this system, ANF promotes diuresis (increased urine output), leading to a decrease in blood volume and subsequently lowering blood pressure.

5. **Conclusion**: Based on the information, the correct answer to the question is that ANF is secreted by the atria of the heart.

**Final Answer**: Atrial Natriuretic Factor (ANF) is secreted by the atria of the heart.

---