Which of the following epithelia is much thinner and more stretchable than the stratified epithelium and covers the inner surface of urinary bladder and ureter?

Options

A. Transitional
B. Compound
C. Simple
D. Stratified

Answer

To answer the question regarding which type of epithelium is thinner and more stretchable than stratified epithelium and covers the inner surface of the urinary bladder and ureter, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Epithelial Tissue**: Epithelial tissues are layers of cells that cover surfaces and line cavities in the body. They can be classified based on the number of layers and the shape of the cells.

2. **Types of Epithelia**: The question provides several options:
- Transitional epithelium
- Compound epithelium
- Simple epithelium
- Stratified epithelium

3. **Characteristics of Transitional Epithelium**: Transitional epithelium is a specialized type of stratified epithelium that is unique because it can stretch and change shape. It is found in areas that require flexibility, such as the urinary bladder and ureters.

4. **Comparison with Other Types**:
- **Stratified Epithelium**: This type has multiple layers and is generally thicker, providing protection.
- **Simple Epithelium**: This type has a single layer of cells and is thinner than stratified epithelium but does not have the stretchability required for the urinary bladder.
- **Compound Epithelium**: This type consists of multiple layers and is also thicker and less stretchable.

5. **Conclusion**: Since the question specifies that the epithelium in question is much thinner and more stretchable than stratified epithelium and specifically covers the inner surface of the urinary bladder and ureter, the correct answer is **transitional epithelium**.

### Final Answer:
The type of epithelium that is much thinner and more stretchable than stratified epithelium and covers the inner surface of the urinary bladder and ureter is **transitional epithelium**.

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