Which of the following hormones is responsible for the excretion of sodium in urine ?

Options

A. Angiotensin II
B. ADH
C. Aldosterone
D. ANF

Answer

To determine which hormone is responsible for the excretion of sodium in urine, let's analyze the options provided:

1. **Angiotensin-2**: This hormone is primarily involved in increasing blood pressure and promoting water retention in the body. It does not promote sodium excretion; rather, it helps in sodium reabsorption.

2. **ADH (Atrial Diuretic Hormone)**: ADH, also known as vasopressin, regulates water balance in the body by acting on the kidneys. It primarily focuses on water reabsorption rather than sodium excretion.

3. **Aldosterone**: This hormone is produced by the adrenal glands and is responsible for promoting sodium reabsorption in the kidneys. It leads to the retention of sodium and the excretion of potassium, which means it does not facilitate sodium excretion.

4. **ANF (Atrial Natriuretic Factor)**: ANF is a hormone that is released by the heart in response to increased blood volume and pressure. It acts on the kidneys to promote sodium excretion and increase glomerular filtration rate, thereby leading to increased urine output.

Based on the analysis of these hormones, the correct answer is **ANF (Atrial Natriuretic Factor)**, as it is specifically responsible for the excretion of sodium in urine.

### Final Answer:
**ANF (Atrial Natriuretic Factor)** is the hormone responsible for the excretion of sodium in urine.