Voluntary response to distension of urinary bladder is

Options

A. Polyuria
B. Micturition
C. Diabetes mellitus
D. Menstruation

Answer

To solve the question "Voluntary response to distension of urinary bladder is," we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**:
- The question asks for a voluntary response to the distension (stretching) of the urinary bladder. This means we are looking for a physiological response that is consciously controlled.

2. **Analyzing the Options**:
- **Option A: Polyuria**:
- Polyuria refers to the condition of excessive urination. It is not a voluntary response; rather, it is a symptom of an underlying condition (like diabetes) that leads to increased urination. Thus, this option is incorrect.

- **Option B: Micturition**:
- Micturition is the process of urination, which is indeed a voluntary response. When the urinary bladder is distended, stretch receptors send signals to the brain, and the individual can consciously decide when to urinate. This makes micturition the correct answer.

- **Option C: Diabetes Mellitus**:
- Diabetes mellitus is a metabolic disorder characterized by high blood glucose levels, which can lead to polyuria. However, it is not a voluntary response to bladder distension. Therefore, this option is incorrect.

- **Option D: Menstruation**:
- Menstruation is a biological process related to the female reproductive system, involving the shedding of the uterine lining. It does not pertain to the urinary bladder or its distension. Thus, this option is also incorrect.

3. **Conclusion**:
- After analyzing all the options, the only correct answer that represents a voluntary response to the distension of the urinary bladder is **Micturition**.

### Final Answer:
The correct answer is **Micturition**.