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The presence of in blood reduces the ox...

The presence of _____ in blood reduces the oxygen-carrying capacity of blood.

A

Carbon dioxide

B

Carboxyhaemoglobin

C

Lead

D

Mercury

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks for a substance present in the blood that reduces its oxygen-carrying capacity. 2. **Identifying the Substance**: The key substance that affects the oxygen-carrying capacity of blood is carbon monoxide (CO). 3. **Mechanism of Action**: Carbon monoxide binds to hemoglobin in red blood cells. Hemoglobin is the protein responsible for carrying oxygen throughout the body. 4. **Formation of Carboxyhemoglobin**: When carbon monoxide binds to hemoglobin, it forms a compound known as carboxyhemoglobin. This compound is less effective at transporting oxygen compared to normal hemoglobin. 5. **Consequences of Reduced Capacity**: The presence of carboxyhemoglobin decreases the overall oxygen-carrying capacity of the blood, which can lead to serious health issues, including cardiovascular diseases. 6. **Conclusion**: Therefore, the correct answer to the question is "carbon monoxide," which is the substance that reduces the oxygen-carrying capacity of blood. **Final Answer**: The presence of **carbon monoxide** in blood reduces the oxygen-carrying capacity of blood. ---
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