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Question
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What is the primary effect of exercise on the cardiorespiratory system?
Options
Decreased heart rate
Increased stroke volume
Decreased lung capacity
Decreased blood pressure
MCQ
Solution
Increased stroke volume
Explanation:
Exercise primarily improves the efficiency of the cardiorespiratory system by increasing stroke volume, which is the amount of blood ejected by the heart with each beat. This allows the heart to pump more blood per beat, improving oxygen delivery to muscles. Over time, regular exercise can also lead to a decrease in resting heart rate and blood pressure, but the immediate and primary effect during exercise is an increase in stroke volume.
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