Fatigue is caused by
A)gradual muscle weakening after repetitive use.
B)depletion of ATP.
C)depletion of acetylcholine from motor neurons.
D)All apply.

Question

Quizplus · Accepted Answer

Fatigue is caused by all of the above factors. Gradual muscle weakening after repetitive use can lead to fatigue as the muscles become exhausted and are no longer able to contract with the same force. Depletion of ATP, the energy currency of the body, can also lead to fatigue as the muscles are no longer able to produce the energy needed for contraction. Depletion of acetylcholine from motor neurons can also cause fatigue as this neurotransmitter is essential for activating muscles.

Fatigue Is Caused by