About 97 % of oxygen is transported by RBC. The remaining 3 % is

Options

A. present in peroxisomes
B. remains in lungs
C. trapped inside the mitochondria
D. dissolved in plasma and transported

Answer

### Step-by-Step Solution:

1. **Understanding Oxygen Transport**: The question states that about 97% of oxygen is transported by red blood cells (RBCs). This implies that there is a small percentage of oxygen that is transported differently.

2. **Identifying the Remaining Percentage**: Since 97% of oxygen is carried by RBCs, the remaining percentage is 100% - 97% = 3%.

3. **Mechanism of Oxygen Transport**: The primary mechanism for oxygen transport in the blood is through hemoglobin, which is found in red blood cells. Hemoglobin binds to oxygen molecules.

4. **Role of Plasma**: The remaining 3% of oxygen is not bound to hemoglobin. Instead, it is dissolved in the plasma, which is the liquid component of blood. Plasma serves as a medium for transporting various substances, including oxygen.

5. **Conclusion**: Therefore, the answer to the question is that the remaining 3% of oxygen is transported dissolved in the plasma.

### Final Answer:
The remaining 3% of oxygen is transported dissolved in the plasma.

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