When the concentration of oxygen in the blood decreases, the speed of breathing is-

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Increases. When the concentration of oxygen in the blood decreases, the speed of breathing increases. 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.

When the concentration of oxygen in the blood decreases, the speed of breathing is-

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