During exercise there is an increase in physical activity and muscle cells respire more than they do when the body is at rest. The heart rate increases during exercise. The rate and depth of breathing increases... this makes sure that more oxygen is absorbed into the blood, and more carbon dioxide is removed from it.
Explanation:
The lungs provide a faster way to help control the pH of the blood. In response to exercise, the body increases its breathing rate which helps to counteract the pH-lowering effects of exercise by removing CO2, a component of the principal pH buffer in the blood.
Hey there, when you are exercising, your muscles need extra oxygen—some three times as much as resting muscles. This need means that your heart starts pumping faster, which makes for a quicker pulse. Meanwhile, your lungs are also taking in more air, hence the harder breathing.
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