Ratio of RBCs and WBCs in human being is

Options

A. `300 : 1`
B. `500 : 3`
C. `7 :4`
D. `600 : 1`

Answer

To determine the ratio of Red Blood Cells (RBCs) to White Blood Cells (WBCs) in humans, we can follow these steps:

### Step 1: Understand the average counts of RBCs and WBCs
- The average count of RBCs in a human being is approximately **4.5 to 5.5 million cells per cubic millimeter**.
- The average count of WBCs is about **8,000 to 10,000 cells per cubic millimeter**.

### Step 2: Calculate the ratio
- To find the ratio of RBCs to WBCs, we can use the average values:
- Let's take the average for RBCs as **5 million** and for WBCs as **9,000** (the midpoint of 8,000 and 10,000).

- Now, we can set up the ratio:
\[ \text{Ratio of RBCs to WBCs} = \frac{5,000,000}{9,000} \]

### Step 3: Simplify the ratio
- Performing the division:
\[ \frac{5,000,000}{9,000} \approx 555.56 \]
- This means that for every 1 WBC, there are approximately **556 RBCs**.

### Step 4: Express the ratio in whole numbers
- To express this in a simpler ratio format, we can round it:
- This can be approximated to **600 RBCs for every 1 WBC**.

### Step 5: Conclusion
- Therefore, the ratio of RBCs to WBCs in humans is **600:1**.

### Final Answer
The ratio of RBCs to WBCs in a human being is **600:1**.

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