Carbon monoxide can kill a person because of it's extermely high affinity for

Options

A. haemoglobin
B. phytochrome
C. cytochrome
D. none of these

Explanation

**Step-by-Step Solution:**

1. **Understanding Carbon Monoxide (CO):** Carbon monoxide is a colorless, odorless gas that is highly toxic to humans and animals. It is produced from incomplete combustion of carbon-containing fuels.

2. **Affinity for Hemoglobin:** Carbon monoxide has an extremely high affinity for hemoglobin, which is the protein in red blood cells responsible for transporting oxygen throughout the body.

3. **Comparison with Oxygen (O2):** The affinity of carbon monoxide for hemoglobin is approximately 200 times greater than that of oxygen. This means that when both gases are present, carbon monoxide will preferentially bind to hemoglobin over oxygen.

4. **Formation of Carboxyhemoglobin:** When carbon monoxide binds to hemoglobin, it forms a compound known as carboxyhemoglobin. This compound prevents hemoglobin from carrying oxygen, leading to oxygen deprivation in the body.

5. **Health Consequences:** The binding of carbon monoxide to hemoglobin can lead to serious health issues such as headaches, nausea, paralysis, and ultimately, death if exposure is prolonged or at high concentrations.

6. **Conclusion:** Therefore, the reason carbon monoxide can kill a person is due to its extremely high affinity for hemoglobin.

**Final Answer:** Carbon monoxide can kill a person because of its extremely high affinity for **hemoglobin**.

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