Simple squamous epithelium lining the blood vessels is called

Options

A. Mesothelium
B. Endothelium
C. Pavement epithelium
D. Tessellated epithelium

Answer

To answer the question "Simple squamous epithelium lining the blood vessels is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Epithelium**:
- Epithelium is a type of tissue that covers body surfaces and lines cavities and organs.
- Simple squamous epithelium consists of a single layer of flat cells.

2. **Identify the Location**:
- The question specifically mentions the lining of blood vessels.
- Blood vessels are part of the circulatory system.

3. **Review the Options**:
- Option 1: Mesothelium - This type of epithelium lines body cavities (like pleura, pericardium, and peritoneum) but not blood vessels.
- Option 2: Endothelium - This is the specific term for the simple squamous epithelium that lines blood vessels and lymphatic vessels.
- Option 3: Pavement epithelium - This is another term for simple squamous epithelium but does not specifically refer to blood vessels.
- Option 4: Tessellated epithelium - This is synonymous with pavement epithelium and also does not specifically refer to blood vessels.

4. **Select the Correct Answer**:
- Based on the definitions and locations, the correct answer is **Option 2: Endothelium**.

### Final Answer:
The simple squamous epithelium lining the blood vessels is called **endothelium**.