The ratio of WBC : RBC is about……….. In man

Options

A. `1:600`
B. `1:6000`
C. `1:60000`
D. `1:200`

Answer

To determine the ratio of white blood cells (WBC) to red blood cells (RBC) in humans, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Components**:
- White Blood Cells (WBC) are crucial for the immune system and defense against infections.
- Red Blood Cells (RBC) are responsible for transporting oxygen throughout the body.

2. **Know the Average Counts**:
- The average count of RBC in a healthy human is approximately 5 million cells per cubic millimeter (mm³) of blood.
- The average count of WBC is about 7,000 cells per cubic millimeter (mm³) of blood.

3. **Calculate the Ratio**:
- To find the ratio of WBC to RBC, we can use the formula:
\[ \text{Ratio of WBC to RBC} = \frac{\text{Number of WBC}}{\text{Number of RBC}} \]
- Plugging in the values:
\[ \text{Ratio} = \frac{7000}{5000000} \]

4. **Simplify the Ratio**:
- This simplifies to:
\[ \text{Ratio} = \frac{1}{714.29} \approx 1:600 \]
- This means that for every 600 RBC, there is approximately 1 WBC.

5. **Conclusion**:
- Therefore, the ratio of WBC to RBC in humans is approximately 1:600.

### Final Answer:
The ratio of WBC to RBC in man is about **1:600**.