1.

After fast running, man has fast heart beat, slow pulse and shallow breathing, in such conditions he hasA. Oxygen debtB. Poisoning due to lactic acidC. No pulmonary pressureD. Weak heart

Answer» Correct Answer - a
rate of `O_(2)` supply by lungs into muscles falls down during active work or in exercise. Muscles accumulate lactic acid and slowly breathing becomes hard so as to inceases `O_(2)` intake in lungs.this stage is called oxygen debt.


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