The increase in blood flow to heart stimulates secretion of

Options

A. Renin
B. Oxytocin
C. Antidiuretic hormone
D. Atrial natriuretic factor

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks what substance is secreted in response to an increase in blood flow to the heart.

2. **Identifying the Options**: The options provided are:
- A) Renin
- B) Oxytocin
- C) Antidiuretic hormone
- D) Atrial Natriuretic Factor (ANF)

3. **Analyzing Each Option**:
- **Renin**: This is an enzyme secreted by the kidneys in response to low blood pressure or low blood volume, not increased blood flow.
- **Oxytocin**: This hormone is primarily involved in childbirth and lactation and is not directly related to blood flow to the heart.
- **Antidiuretic Hormone (ADH)**: This hormone helps regulate water balance in the body but is not specifically stimulated by increased blood flow to the heart.
- **Atrial Natriuretic Factor (ANF)**: This is a hormone secreted by the atria of the heart in response to increased blood volume and pressure.

4. **Conclusion**: The correct answer is D) Atrial Natriuretic Factor (ANF), as it is specifically released when there is an increase in blood flow and pressure in the heart.

5. **Explanation of ANF Function**: ANF helps maintain electrolyte homeostasis by promoting sodium excretion, which decreases extracellular fluid (ECF) and blood volume, counteracting the increase in blood flow.

**Final Answer**: The increase in blood flow to the heart stimulates secretion of Atrial Natriuretic Factor (ANF).

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