Inner lining of stomach, rectum and colon is made of :-

Options

A. Simple squamous epi.
B. Simple cuboidal epi.
C. Simple columnar epi.
D. Pseudostratified epi.

Answer

To determine what type of epithelial tissue makes up the inner lining of the stomach, rectum, and colon, we will analyze the options provided:

### Step-by-Step Solution:

1. **Understand the Types of Epithelial Tissue**:
- Epithelial tissues are classified based on the shape and arrangement of their cells. The main types include:
- Simple squamous epithelium
- Simple cuboidal epithelium
- Simple columnar epithelium
- Pseudostratified epithelium

2. **Evaluate Each Option**:
- **Option 1: Simple Squamous Epithelium**:
- This type consists of flat cells arranged in a single layer. It is typically found in areas where diffusion or filtration occurs, such as the lining of blood vessels and alveoli in the lungs.
- **Conclusion**: Not suitable for the stomach, rectum, or colon.

- **Option 2: Simple Cuboidal Epithelium**:
- This type consists of cube-shaped cells and is found in glands and ducts (like the kidneys and salivary glands).
- **Conclusion**: Not found in the digestive tract, so this option is also incorrect.

- **Option 3: Simple Columnar Epithelium**:
- This type consists of tall, closely packed cells. It is found in areas with high secretory and absorptive functions, such as the lining of the stomach, small intestine, and large intestine (colon).
- **Conclusion**: This is the correct option as it is present in the stomach, rectum, and colon.

- **Option 4: Pseudostratified Epithelium**:
- This type appears to be stratified due to varying cell heights but is actually a single layer. It is primarily found in the respiratory tract (like the trachea).
- **Conclusion**: Not suitable for the digestive tract.

3. **Final Answer**:
- The inner lining of the stomach, rectum, and colon is made of **Simple Columnar Epithelium** (Option 3).