Which of following is not the action of sympathetic nervous system ?

Options

A. Dilation of pupil
B. Storage of bile in the gall bladder
C. Constriction of peripheral arteries
D. Contraction in the wall of urinary bladder

Answer

To solve the question "Which of the following is not the action of the sympathetic nervous system?", we need to analyze the options provided and understand the functions of the sympathetic nervous system (SNS).

### Step-by-Step Solution:

1. **Understand the Sympathetic Nervous System (SNS)**:
- The SNS is part of the autonomic nervous system and is primarily responsible for the body's 'fight or flight' response during stressful situations. It prepares the body to respond to emergencies.

2. **List the Functions of the SNS**:
- Increased heart rate
- Dilation of pupils (pupil dilation)
- Widening of bronchial passages
- Decreased motility of the large intestine
- Constriction of peripheral arteries
- Increased sweating
- Pyloerection (goosebumps)

3. **Analyze Each Option**:
- **Option A: Dilation of pupil** - This is a function of the SNS (correct action).
- **Option B: Storage of bile in the gallbladder** - This is not a typical action of the SNS. In fact, the storage of bile is more associated with the parasympathetic nervous system (PNS), which promotes digestion and storage functions.
- **Option C: Constriction of peripheral arteries** - This is a function of the SNS (correct action).
- **Option D: Contraction in the wall of the urinary bladder** - This is also not a function of the SNS; it is primarily controlled by the PNS, which facilitates bladder contraction.

4. **Identify the Correct Answer**:
- Based on the analysis, **Option B: Storage of bile in the gallbladder** and **Option D: Contraction in the wall of the urinary bladder** are not actions of the SNS. However, since the question asks for one option that is not an action of the SNS, the most appropriate answer is **Option B**.

### Final Answer:
**The correct answer is: Storage of bile in the gallbladder.**