Discussion
After a person quits smoking, the lungs can heal to a certain extent, because of ________ .
Answer: A
The key gives Decrease in carbon monoxide.
Cigarette smoke carries carbon monoxide, which binds haemoglobin and reduces the oxygen the blood can carry. Within a day of quitting, the carbon monoxide level falls, the blood carries oxygen normally again and the lungs begin to recover. This is the answer the Commission fixed.
Be aware that the question is loosely worded. The airway lining also regenerates over months after quitting, so synthesis of new mucosa is a real part of healing, but it is the slower, structural change and the key does not use it. An increase in oxygen uptake is a result of the lower carbon monoxide, not its cause, and long-term inflammatory changes are damage, not healing.
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