An epithelium lacking basement membrane is

Options

A. Sensory
B. Glandular
C. Pseudostratified
D. Transitional.

Answer

**Step-by-Step Text Solution:**

1. **Understanding Basement Membrane**: The basement membrane, also known as the basal lamina, is an extracellular sheet of proteins that surrounds epithelial tissues. It provides structural support, facilitates filtration, and aids in cell attachment, migration, and differentiation.

2. **Types of Epithelium**: The question lists several types of epithelium: sensory, glandular, pseudostratified, and transitional. It is essential to determine which of these lacks a basement membrane.

3. **Analyzing Each Type**:
- **Sensory Epithelium**: Typically has a basement membrane to support sensory cells.
- **Glandular Epithelium**: Also possesses a basement membrane for structural integrity and function.
- **Pseudostratified Epithelium**: This type of epithelium has a basement membrane that supports its stratified appearance.
- **Transitional Epithelium**: This is a unique type of epithelium that can change shape depending on the degree of stretch. It is known for its ability to expand and contract, and it does not have a distinct basement membrane.

4. **Conclusion**: Based on the analysis, the epithelium that lacks a basement membrane is the **transitional epithelium**. This type of epithelium is found lining parts of the urinary tract, including the renal pelvis, and is characterized by its waterproof and stretchable properties.

5. **Final Answer**: Therefore, the correct answer to the question "An epithelium lacking basement membrane is" is **transitional epithelium**.

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