Number of haemoglobin molecules present in an average
human body is

Options

A. 6000 million million
B. 6000 million million million
C. 6 million million million
D. 600 million million million

Answer

To determine the number of hemoglobin molecules present in an average human body, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Hemoglobin**: Hemoglobin is an oxygen-carrying protein found in red blood cells (RBCs). It is crucial for transporting oxygen from the lungs to the rest of the body.

2. **Determine Hemoglobin per RBC**: Each red blood cell contains approximately 270 million hemoglobin molecules.

3. **Estimate the Number of RBCs**: An average human body has about 5 million red blood cells per microliter of blood. The total blood volume in an average adult human is approximately 5 liters, which is equivalent to 5,000,000 microliters.

4. **Calculate Total RBCs**: Multiply the number of RBCs per microliter by the total blood volume in microliters:
\[ \text{Total RBCs} = 5,000,000 \, \text{RBCs/microliter} \times 5,000,000 \, \text{microliters} = 25,000,000,000,000 \, \text{RBCs} \]

5. **Calculate Total Hemoglobin Molecules**: Now, multiply the total number of RBCs by the number of hemoglobin molecules per RBC:
\[ \text{Total Hemoglobin} = 25,000,000,000,000 \, \text{RBCs} \times 270,000,000 \, \text{hemoglobin/RBC} \]
\[ = 6,750,000,000,000,000,000 \, \text{hemoglobin molecules} \]

6. **Convert to Scientific Notation**: The total can be simplified to approximately 6,000,000,000,000 (6 trillion) hemoglobin molecules in the average human body.

7. **Final Answer**: The number of hemoglobin molecules present in an average human body is approximately 6,000,000,000,000.