A decrease in blood pressure `//` volume will not cause the release of

Options

A. Renin
B. Atrial Natriuretic Factor
C. Aldosterone
D. ADH

Answer

To solve the question "A decrease in blood pressure/volume will not cause the release of," we need to analyze the hormones involved in blood pressure regulation and their responses to changes in blood pressure.

### Step-by-Step Solution:

1. **Understand Blood Pressure Regulation**: Blood pressure is regulated by various hormones that respond to changes in blood volume and pressure. When blood pressure decreases, the body activates mechanisms to restore it.

2. **Identify Key Hormones**:
- **ADH (Antidiuretic Hormone)**: Released when blood pressure decreases to promote water reabsorption in the kidneys, thus increasing blood volume and pressure.
- **Renin**: Released by the kidneys in response to low blood pressure. It activates the renin-angiotensin-aldosterone system (RAAS), which helps to increase blood pressure.
- **Aldosterone**: Secreted in response to renin; it promotes sodium reabsorption in the kidneys, which helps to increase blood volume and pressure.

3. **Consider Atrial Natriuretic Factor (ANF)**: This hormone is released by the heart's atria in response to increased blood pressure. Its function is to promote the excretion of sodium and water, which lowers blood volume and pressure.

4. **Determine the Correct Answer**: Since the question asks for the hormone that will not be released with a decrease in blood pressure, we identify that:
- ADH, renin, and aldosterone are all released when blood pressure decreases.
- Atrial natriuretic factor is released when blood pressure increases, not when it decreases.

5. **Conclusion**: Therefore, the hormone that will not be released due to a decrease in blood pressure/volume is **Atrial Natriuretic Factor (ANF)**.

### Final Answer:
The correct answer is **Atrial Natriuretic Factor (ANF)**.

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