When a man inhales air containing normal concentration of `O_(2)` as well as CO he suffers from suffocation because

Options

A. Haemoglobin combines with co instead of with `O_(2)` and product cannot dissociate
B. co reacts with `O_(2)` reducing percentage of `O_(2)` in the blood
C. CO affecrts the diapharagma and intercostal muscles
D. CO affects the nerve of the lungs

Answer

**Step-by-Step Solution:**

1. **Understanding the Components:**
- When a person inhales air, it contains a mixture of gases, primarily oxygen (O₂) and nitrogen (N₂). However, if carbon monoxide (CO) is also present, it can interfere with normal respiratory function.

2. **Role of Hemoglobin:**
- Hemoglobin is a protein in red blood cells that binds to oxygen and transports it throughout the body. It can also bind to carbon monoxide.

3. **Affinity of Hemoglobin for Gases:**
- Hemoglobin has a higher affinity for carbon monoxide than for oxygen. This means that when both gases are present, hemoglobin is more likely to bind with carbon monoxide.

4. **Formation of Carboxyhemoglobin:**
- When carbon monoxide binds to hemoglobin, it forms a stable complex known as carboxyhemoglobin (HbCO). This complex is much more stable than the oxygen-hemoglobin complex (HbO₂).

5. **Impact on Oxygen Transport:**
- Because the carboxyhemoglobin complex is stable and does not easily dissociate, it prevents hemoglobin from binding to oxygen. As a result, even if there is a normal concentration of oxygen in the air, the body cannot effectively transport oxygen to tissues.

6. **Consequences of Reduced Oxygen Availability:**
- The inability to transport oxygen leads to a deficiency of oxygen in the body, particularly affecting vital organs like the brain. This condition results in suffocation, as the body is deprived of the oxygen it needs to function.

7. **Conclusion:**
- Therefore, the correct answer to the question is that a man suffers from suffocation because hemoglobin combines with carbon monoxide instead of oxygen, and the resulting product (carboxyhemoglobin) cannot dissociate to release oxygen.

**Final Answer:**
- Hemoglobin combines with carbon monoxide instead of oxygen, and the product can't dissociate.

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