Which of the following is an action not produced by sympathetico- adrenal system ?

Options

A. Constriction of skin and visceral smooth muscle
B. Dilation of arterioles of heart and skeleton muscles
C. Constriction of pupils
D. Dilation of bronchioles

Answer

To determine which action is not produced by the sympathetic-adrenal system, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understand the Sympathetic-Adrenal System**:
- The sympathetic-adrenal system is part of the autonomic nervous system that prepares the body for 'fight or flight' responses during stressful situations. It is responsible for various physiological changes.

2. **Analyze Option 1: Constriction of skin and visceral smooth muscle**:
- This action is indeed produced by the sympathetic nervous system. During emergencies, blood vessels in the skin and visceral organs constrict to redirect blood flow to essential organs like the heart and muscles.
- **Conclusion**: This is an action of the sympathetic-adrenal system.

3. **Analyze Option 2: Dilation of arterioles of heart and skeletal muscles**:
- The sympathetic system causes dilation of arterioles in the heart and skeletal muscles to increase blood flow to these areas during stress or emergency.
- **Conclusion**: This is also an action of the sympathetic-adrenal system.

4. **Analyze Option 3: Constriction of pupils**:
- The sympathetic nervous system actually causes dilation of the pupils (mydriasis) to allow more light in and improve vision during emergencies. Therefore, constriction of pupils is not an action produced by the sympathetic system.
- **Conclusion**: This is NOT an action of the sympathetic-adrenal system.

5. **Analyze Option 4: Dilation of bronchioles**:
- The sympathetic system causes dilation of bronchioles to allow for increased airflow to the lungs, which is crucial during a 'fight or flight' response.
- **Conclusion**: This is an action of the sympathetic-adrenal system.

### Final Answer:
The action that is NOT produced by the sympathetic-adrenal system is **Option 3: Constriction of pupils**.

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