Epithelial tissue is

Options

A. Protective covering
B. Reproductive structure
C. Nerve cells
D. Corpuscles

Answer

### Step-by-Step Text Solution:

1. **Definition of Epithelial Tissue**: Epithelial tissue, commonly referred to as epithelium, is a type of tissue that lines the surfaces of organs and structures throughout the body, both internally and externally.

2. **Location**: Epithelial tissue is found covering all layers and organs of the body. This includes the skin (external surface) and the lining of internal organs (such as the digestive tract, respiratory tract, etc.).

3. **Permeability**: Epithelial tissue is characterized by its permeability, meaning it can allow substances to pass through it, which is essential for various bodily functions.

4. **Functions of Epithelial Tissue**:
- **Protection**: One of the primary functions of epithelial tissue is to protect the body from physical damage, pathogens, and dehydration.
- **Absorption**: Epithelial tissues also play a crucial role in the absorption of nutrients and other substances, particularly in the digestive system.
- **Secretion**: Epithelial tissues are involved in the secretion of various substances, such as enzymes, hormones, and mucus.
- **Sensations**: Certain epithelial tissues are specialized for sensation, allowing the body to perceive stimuli from the environment.

5. **Main Function**: The main function of epithelial tissue is protective in nature, serving as a barrier to protect underlying tissues and organs.