During exercise, the time spent in diastole and systole…- remains unchanged.- is decreased, with the greatest decrease occurring in diastole. – is increased, with the greatest increase occurring in diastole.- is decreased equally.
is decreased, with the greatest decrease occurring in diastole.
During exercise, the time spent in diastole and systole is decreased, with the greatest decrease occurring in diastole. This is because during exercise, the heart needs to pump more blood to working muscles to supply them with oxygen and nutrients, and also to remove waste products. To do this, the heart must contract more frequently, and this decreases the time available for relaxation (diastole) between contractions. Therefore, the amount of time spent in systole increases, and the amount of time spent in diastole decreases, with the greatest decrease occurring in diastole. This is why heart rate increases during exercise.
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