During strenuous exercise
A) an oxygen debt can occur.
B) lactic acid can be created in the muscle.
C) almost all the contractions are tonic contractions.
D) both A and B.

Question

Quizplus · Accepted Answer

During strenuous exercise, the body may not be able to supply enough oxygen to the muscles to meet their demands, resulting in an oxygen debt. This can cause the muscle to switch to anaerobic respiration, which produces lactic acid as a byproduct. Therefore, both A and B are true statements. However, not all contractions during strenuous exercise are tonic contractions; they can also be twitch contractions.

During Strenuous Exercise