After fast running, man has a fast heartbeat, slow pulse, and shallow breathing, in such conditions he has
A
Oxygen debt
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B
Poisoning due to lactic acid
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C
No pulmonary pressure
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D
Weak heart
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Solution
The correct option is B Oxygen debt The additional oxygen that must be taken into the body after exercise to restore all systems to their normal states is called oxygen debt. When we exercise, our body uses a lot of oxygen. This is one of the reasons that we breathe so heavily during exercise. Heavy exercise releases lactic acid into the muscles. Extra oxygen is required to help break down the lactic acid. Paying back this oxygen debt essentially helps the body and muscles to return to its normal state.