Epithelia are involved in all except

Options

A. Protection
B. Connection
C. Secretion or excretion
D. Absorption

Answer

To answer the question "Epithelia are involved in all except," we need to analyze the options provided:

1. **Protection**: Epithelial tissues serve as a protective barrier. For instance, the skin is made up of stratified squamous epithelium that protects underlying tissues from mechanical injury, pathogens, and dehydration.

2. **Connection**: Epithelial tissues do not primarily function to connect different tissues or organs. Instead, their main roles include protection, secretion, absorption, and sensation. They are not involved in connecting tissues like connective tissues are.

3. **Secretion or Excretion**: Epithelial cells are involved in secretion (such as glandular epithelium secreting hormones or enzymes) and excretion (like renal tubules in the kidneys).

4. **Absorption**: Certain types of epithelial cells, particularly simple columnar and cuboidal epithelium, are specialized for absorption, such as in the intestines.

Based on this analysis, the correct answer is that epithelia are involved in all except **connection**.

### Step-by-Step Solution:
1. **Identify the functions of epithelial tissues**: Understand the roles of epithelial tissues, which include protection, secretion, absorption, and sensation.

2. **Analyze each option**:
- **Protection**: Confirmed as a function of epithelial tissues.
- **Connection**: Not a primary function of epithelial tissues.
- **Secretion or Excretion**: Confirmed as a function of epithelial tissues.
- **Absorption**: Confirmed as a function of epithelial tissues.

3. **Conclude the answer**: Since epithelial tissues do not primarily function in connection, the answer to the question is that epithelia are involved in all except **connection**.