Which of the following is the most abundant of all the cells found in the blood of humans ?

Options

A. Thrombocytes
B. Erythrocytes
C. Platelets
D. Leucocytes

Answer

To determine which type of blood cell is the most abundant in human blood, we will analyze the three main types of blood cells: red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes).

### Step-by-Step Solution:

1. **Identify the Types of Blood Cells**:
- The three main types of blood cells in humans are:
- Red Blood Cells (RBCs) or Erythrocytes
- White Blood Cells (WBCs) or Leukocytes
- Platelets or Thrombocytes

2. **Examine the Quantity of Each Type of Blood Cell**:
- **Red Blood Cells (Erythrocytes)**: Approximately 4 to 5 million cells per cubic millimeter (mm³) of blood.
- **White Blood Cells (Leukocytes)**: Approximately 8,000 cells per cubic millimeter (mm³) of blood.
- **Platelets (Thrombocytes)**: Approximately 250,000 cells per cubic millimeter (mm³) of blood.

3. **Compare the Numbers**:
- From the numbers:
- Erythrocytes: 4-5 million/mm³
- Leukocytes: 8,000/mm³
- Thrombocytes: 250,000/mm³

4. **Determine the Most Abundant Cell Type**:
- Comparing the values, it is clear that red blood cells (erythrocytes) are significantly more numerous than both white blood cells (leukocytes) and platelets (thrombocytes).

5. **Conclusion**:
- Therefore, the most abundant type of cell found in the blood of humans is **Red Blood Cells (Erythrocytes)**.

### Final Answer:
**Red Blood Cells (Erythrocytes)** are the most abundant cells in human blood.