If a person happens to take large amount of water, the amount of ADH in blood will

Options

A. Increases
B. Decrease
C. First increase then decrease
D. Will remain unchanged.

Answer

To answer the question, "If a person happens to take a large amount of water, the amount of ADH in blood will...," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding ADH**:
- ADH stands for Antidiuretic Hormone, which is produced in the hypothalamus and released by the posterior pituitary gland. Its primary role is to regulate water balance in the body.

**Hint**: Remember that ADH is crucial for water retention and urination control.

2. **Function of ADH**:
- The main function of ADH is to promote water reabsorption in the kidneys. When the body is dehydrated, ADH levels increase to conserve water and reduce urine output.

**Hint**: Think about how the body reacts to dehydration versus hydration.

3. **Effect of Excess Water**:
- When a person consumes a large amount of water, the body becomes more hydrated. In this state, there is less need for ADH because the body does not require additional water conservation.

**Hint**: Consider what happens to hormone levels when the body has enough water.

4. **ADH Levels in Hydration**:
- With increased hydration, the secretion of ADH decreases. This is because the body needs to excrete the excess water, leading to increased urine production.

**Hint**: Focus on the relationship between hydration levels and hormone secretion.

5. **Conclusion**:
- Therefore, if a person takes a large amount of water, the amount of ADH in the blood will decrease.

**Hint**: Summarize the key points: excess water leads to decreased ADH.

### Final Answer:
The amount of ADH in the blood will **decrease**.