ANF causes_____

Answer

**Step-by-Step Solution:**

1. **Identify ANF**: ANF stands for Atrial Natriuretic Factor. It is important to know what ANF is before understanding its effects.

2. **Understand its Composition**: ANF is a peptide hormone composed of 28 amino acids. Recognizing its structure helps in understanding its biological function.

3. **Know the Trigger for Release**: ANF is secreted from the atria of the heart in response to increased atrial pressure. This means that when the heart's atria experience higher pressure, they release ANF.

4. **Determine the Effects of ANF**: The primary effects of ANF include:
- **Atrial Vasodilation**: This means that ANF causes the blood vessels in the atria to widen, which can help reduce blood pressure.
- **Natriuresis**: This refers to the excretion of sodium through urine. ANF promotes the loss of sodium, which can lead to a decrease in blood volume and pressure.

5. **Conclusion**: Therefore, ANF causes atrial vasodilation and natriuresis.

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