Question

Muscle cells in the human body can convert glucose into energy during moderate exercise. During intense exercise, however, the muscles become tired, lactic acid is produced, and pain can set in. Which statement best explains how muscle cell processes change as moderate exercise becomes more intense?


A. Oxygen becomes less available for respiration.

B. Carbon dioxide becomes more available for respiration.

C. Glucose is completely depleted during respiration.

D. ATP becomes depleted during respiration.

Answer 1

During the active and intense physical exercises, the speed of the glycolysis increases and lactate is produced.  During an intense workout, the oxygen depletes.

What happens to the oxygen level?

During the intense workout and exercise, the body muscles and cells cannot convert glucose molecules into energy and follow the pathway in the absence of oxygen resulting in the production of lactic acid.

Oxygen is the main input of the respiration process that becomes depleted and in the absence results in the formation of the lactic acid that provides muscle cells with the energy.

Therefore, option A. oxygen gets depleted and becomes less available for the respiratory process.

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