Which of the following lines the urinary bladder ?

Options

A. Simple epithelium
B. Transitional epithelium
C. Stratified epithelium
D. Pseudostratified epithelium

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which type of epithelium lines the urinary bladder. We need to identify the correct type of epithelial tissue from the options provided.

2. **Identifying the Options**: The options given are:
- Simple epithelium
- Transitional epithelium
- Stratified epithelium
- Pseudostratified epithelium

3. **Analyzing Transitional Epithelium**:
- Transitional epithelium is a specialized type of epithelium that can stretch and change shape.
- It consists of multiple layers of cells, which allows it to accommodate fluctuations in the volume of liquid in the bladder.

4. **Structure of Transitional Epithelium**:
- The base layer consists of cuboidal cells.
- There are 2-3 layers of larger, polygonal or pear-shaped cells in the middle.
- The superficial layer has large, broad, triangular or oval cells.

5. **Function of Transitional Epithelium**:
- The primary function of transitional epithelium is to allow for considerable expansion and contraction, which is essential for the urinary bladder to store urine.

6. **Conclusion**: Based on the above analysis, the type of epithelium that lines the urinary bladder is **Transitional Epithelium**.

### Final Answer:
**Transitional Epithelium** lines the urinary bladder.

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