Describe in detail, the events occurring in the cardiovascular and respiratory systems during exercise.
Aerobic exercise such as running or swimming increases your muscles' need for oxygen and nutrients. You breathe deeper and your pulse increases when you engage in moderate to intense aerobic exercise. [ When you are out of shape, your cardiovascular system cannot adapt quickly in response to your increased exertion and you tire easily. With regular exercise, though, your cardiovascular system
evolves and adapts.
During moderate to intense exercise your heart rate increases, and your heart pumps more blood. As a result, your systolic blood pressure rises and blood volume increases. Systolic pressure quantifies the pressure of blood against your vessel walls as measured when your heart contracts. In healthy young athletes, your diastolic pressure, or your blood pressure as measured between active heart beats, actually drops, because your capillaries and veins relax and dilate somewhat during exercise. The short-term changes in your cardiovascular system return to their resting state when you rest. Long-term benefits of exercise include lower resting heart rate and blood pressure, better circulation to extremities thanks to formation of new capillaries and a quick recovery of resting heart rate after vigorous exertion.
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