How much `CO_(2)` is delivered to the alveoli by every
100 ml of deoxygenated blood?

Options

A. 6 ml
B. 4 ml
C. 5 ml
D. 3 ml

Answer

To solve the question of how much CO₂ is delivered to the alveoli by every 100 ml of deoxygenated blood, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Composition of Deoxygenated Blood**:
- Deoxygenated blood carries carbon dioxide (CO₂) from the tissues back to the lungs for exhalation.

2. **Know the Transport Mechanisms of CO₂**:
- CO₂ is transported in the blood in three forms:
- Dissolved in plasma (about 7-10%)
- Bound to hemoglobin as carbaminohemoglobin (about 20-25%)
- As bicarbonate ions (HCO₃⁻) (about 70%)

3. **Identify the Amount of CO₂ in Deoxygenated Blood**:
- It is known that approximately 4 ml of CO₂ is delivered to the alveoli by every 100 ml of deoxygenated blood.

4. **Conclusion**:
- Therefore, the answer to the question is that every 100 ml of deoxygenated blood delivers approximately **4 ml of CO₂** to the alveoli.

### Final Answer:
Every 100 ml of deoxygenated blood delivers approximately **4 ml of CO₂** to the alveoli.

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