Blood leukocytes are

Options

A. Epithelial
B. Endothelial
C. Glandular
D. Connective

Answer

### Step-by-Step Solution:

1. **Understanding Blood Composition**:
- Blood consists of two main components: blood plasma and blood cells.
- Blood plasma makes up about 55% of blood, while blood cells account for approximately 45%.

2. **Identifying Blood Cells**:
- Blood cells are categorized into three main types:
- Red Blood Cells (RBCs) - scientifically known as erythrocytes.
- White Blood Cells (WBCs) - scientifically known as leukocytes.
- Platelets - scientifically known as thrombocytes.

3. **Focusing on Leukocytes**:
- The question specifically asks about blood leukocytes, which refers to the white blood cells (WBCs).

4. **Analyzing the Options**:
- The options provided are:
1. Epithelial
2. Endothelial
3. Glandular
4. Connective

5. **Defining Each Option**:
- **Epithelial**: This type of tissue serves as an outer covering or lining for organs and structures.
- **Endothelial**: This refers to the inner lining of blood vessels and lymphatic vessels.
- **Glandular**: This tissue is associated with glands, both exocrine and endocrine.
- **Connective**: This type of tissue supports, binds together, and protects tissues and organs of the body.

6. **Determining the Correct Answer**:
- Since blood, including leukocytes (WBCs), is classified as a specialized connective tissue, the correct answer to the question "Blood leukocytes are" is:
- **Option 4: Connective**.