Question

art has recently quit smoking. what benefit can he expect to occur within a few hours of quitting?
blood oxygen levels returned to normal
risk of heart disease cut in half
improved liver health
reduced coughing and congestion

Explanation:

• blood oxygen levels returned to normal: Within a few hours of quitting smoking, the carbon monoxide (from smoke) in the blood starts to clear, and blood oxygen levels can return to normal as the body no longer has this gas competing with oxygen for binding to hemoglobin.
• risk of heart disease cut in half: This is a long - term benefit (usually takes years) and not something that happens within a few hours.
• improved liver health: Smoking mainly affects the respiratory and cardiovascular systems initially. Improvements in liver health due to quitting smoking are not an immediate (few hours) effect.
• reduced coughing and congestion: While coughing and congestion may improve over time, the immediate (within hours) effect related to oxygen and carbon monoxide exchange is the normalization of blood oxygen levels. The reduction in coughing and congestion is more of a short - term (days to weeks) rather than hours - long effect.

Answer:

A. blood oxygen levels returned to normal