ADH carries out following functions except

Options

A. Increases blood pressure
B. Increases glomerular filtrate rate
C. Increases permeability for water in DCT
D. Increase `Na^(+)` excretion.

Answer

To solve the question regarding the functions of ADH (Antidiuretic Hormone), we will analyze each of the options provided and determine which one is not a function of ADH.

### Step-by-Step Solution:

1. **Understanding ADH**:
- ADH, also known as vasopressin, is a hormone produced by the hypothalamus and released from the posterior pituitary gland. Its primary role is to regulate water balance in the body.

2. **Analyzing the Functions**:
- **Increase Blood Pressure**:
- ADH can cause blood vessels to constrict, which can lead to an increase in blood pressure. This is a function of ADH.

- **Increase Glomerular Filtrate Rate**:
- ADH does not directly increase the glomerular filtration rate (GFR); however, it can influence it indirectly by increasing blood volume and pressure, which can enhance GFR. But this is not its primary function.

- **Increase Permeability for Water in DCT**:
- One of the main functions of ADH is to increase the permeability of the distal convoluted tubule (DCT) and collecting ducts to water, leading to increased water reabsorption. This is a function of ADH.

- **Increase Sodium Excretion**:
- ADH does not promote sodium excretion; in fact, it primarily focuses on water retention. Therefore, this is not a function of ADH.

3. **Conclusion**:
- Based on the analysis, the function that ADH does not carry out is "increase sodium excretion." Therefore, the correct answer is option number four.

### Final Answer:
ADH carries out the following functions except **increase sodium excretion**.