What is the typical feature of epithelium? How different is it from connective tissue?

Explanation

### Step-by-Step Text Solution:

1. **Definition of Epithelium**: Epithelium is a type of tissue that forms the outer layer of the body and lines the cavities and organs. It serves as a protective barrier and is involved in absorption, secretion, and sensation.

2. **Typical Feature of Epithelium**: A key characteristic of epithelial tissue is the absence of intercellular space. The cells are closely packed together, which means there is little to no space between them. This compact arrangement is facilitated by specialized structures known as cell adhesion molecules, such as desmosomes.

3. **Function of Epithelial Tissue**: The compact arrangement of epithelial cells allows for greater resistance and impermeability, which is essential since epithelial tissue is exposed to the external environment. This feature helps prevent the entry of foreign materials into the body.

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