If epithelial cells are classified according to their function, the classes would include those involved with :

Options

A. support, transport, storage
B. defense, support, storage
C. liming, covering, secreting
D. protection, defense, transport

Answer

### Step-by-Step Solution

1. **Understanding Epithelial Tissue**: Epithelial tissue is a type of tissue that covers the body surfaces, lines cavities, and forms glands. It is primarily classified based on its structure and function.

2. **Types of Epithelial Tissue**: There are two main types of epithelial tissue:
- **Glandular Epithelium**: This type is responsible for secretion. Examples include the thyroid glands, adrenal glands, and salivary glands.
- **Covering and Lining Epithelium**: This type serves as a protective layer and lines various organs and cavities. It forms the outer layer of the skin and the inner lining of blood vessels, ducts, and body cavities.

3. **Classification Based on Function**: If we classify epithelial cells according to their function, we can identify two main classes:
- **Secreting Epithelium**: This includes glandular epithelium that is involved in secretion.
- **Covering and Lining Epithelium**: This includes epithelium that provides protection and lines various structures in the body.

4. **Evaluating Options**: Based on the classification:
- The functions of epithelial cells do not include support, transport, or storage.
- The correct classifications based on function are:
- **Lining and Covering Epithelium**
- **Secreting Epithelium**

5. **Conclusion**: Therefore, if epithelial cells are classified according to their function, the classes would include those involved with lining, covering, and secreting.