Question

oxygen is not sufficent during vigorus execrise,muscle start​

Answer 1

Answer:

if insufficient oxygen is available to the muscles for instance the exercise is vigorous and the heart and lungs are unable to supply sufficient oxygen muscles continued to contract but less efficiently during long periods of various activity latic acid level build up.

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Answer 2

Answer:

In sufficient oxygen is available to the muscles, for instance the exercise is vigorous or prolongedg the heart and lungs are unable to supply sufficient oxygen.......glycogen reserves in the muscles become low as more glucose is used for respiration, and additional glucose is transported from the liver.