How much amount of carbondioxide is transported by plasma?

Options

A. (1) 75 % to 78%
B. (2)5% to 7%
C. (3) 20% to 25%
D. (4)93%

Answer

To answer the question of how much carbon dioxide is transported by plasma, we can break down the information step by step:

### Step-by-Step Solution:

1. **Understanding Carbon Dioxide Transport**:
- Carbon dioxide (CO2) is produced in the tissues as a byproduct of metabolism and needs to be transported to the lungs for exhalation.

2. **Modes of Transport**:
- CO2 is transported in the blood in three main forms:
- Dissolved in plasma
- Bound to hemoglobin in red blood cells (RBCs)
- As bicarbonate ions (HCO3-) formed in the blood.

3. **Focus on Plasma Transport**:
- The question specifically asks about the amount of CO2 transported by plasma, not by RBCs or in other forms.

4. **Percentage of CO2 in Plasma**:
- According to the information provided, approximately 75% to 78% of carbon dioxide is transported dissolved in plasma.

5. **Conclusion**:
- Therefore, the amount of carbon dioxide transported by plasma is about 75% to 78% of the total CO2 in the blood.

### Final Answer:
Approximately 75% to 78% of carbon dioxide is transported by plasma.

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