Question

multiple select question select all that apply which of the following are reasons muscles can become fatigued? (select all that apply.) atp depletion excess of calcium in the sarcoplasm lack of sodium in the sarcoplasm lack of ach (acetylcholine) at neuromuscular junction build up of lactic acid

Explanation:

ATP is the energy - source for muscle contraction, so its depletion causes fatigue. Excess calcium can disrupt muscle function. Lack of ACh at the neuromuscular junction prevents muscle activation. Lactic acid build - up during anaerobic respiration can cause fatigue. Sodium levels in the sarcoplasm are not a typical cause of muscle fatigue.

Answer:

A. ATP depletion
B. Excess of calcium in the sarcoplasm
D. Lack of ACh (acetylcholine) at neuromuscular junction
E. Build up of lactic acid