What are the cellular components of blood?

Explanation

### Step-by-Step Solution:

1. **Identify the Cellular Components of Blood**:
Blood consists of several components, but when we talk about cellular components, we focus on three main types: erythrocytes, leukocytes, and thrombocytes.

2. **Erythrocytes (Red Blood Cells)**:
- Erythrocytes, commonly known as red blood cells (RBCs), are the most abundant cells in the blood.
- Their primary function is to carry oxygen from the lungs to the body's tissues and return carbon dioxide from the tissues back to the lungs.
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