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11) During intense physical exercise, human cells and tissues increjise their need for oxygen to provide the ATP necessary for work. Why does heart rate have to increase to meet the need for oxygen? (5 points)
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To meet the need of oxygen, heart pump more deoxygenated blood from dfferent part of the body to lungs and bring back more oxygenated blood from lungs and pump oxygenated blood towards different part of the tissues and organ. When you increase your muscle action, your heart beats faster and harder to send oxygen to your cells, ejecting a greater volume of blood with each stroke. To perform this activity fast , heart rate increases.

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