Which one of the following types of cell is involved in making of the inner walls of large blood vessels ?

Options

A. Cuboidal epithelium
B. columnar epithelium
C. Squamous epithelium
D. Stratified epithelium

Explanation

To solve the question regarding which type of cell is involved in making the inner walls of large blood vessels, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of Blood Vessels**: Understand that blood vessels have different layers, and the innermost layer is crucial for the function of the vessel.

2. **Define the Innermost Layer**: The innermost lining of blood vessels is known as the endothelium. This is a specific type of tissue that plays a critical role in vascular biology.

3. **Determine the Type of Epithelium**: The endothelium is composed of simple squamous epithelium. This type of epithelium consists of a single layer of flat cells.

4. **Characteristics of Simple Squamous Epithelium**: Recognize that simple squamous epithelial cells are large, closely packed, and resemble a pavement. They rest on a thin basement membrane, which supports them.

5. **Conclusion**: Based on the above information, we conclude that the type of cell involved in making the inner walls of large blood vessels is simple squamous epithelium.

### Final Answer:
The type of cell involved in making the inner walls of large blood vessels is **simple squamous epithelium**.

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