The inability to contract muscles would result in paralysis.
Acetylcholine is used at the neuromuscular junctions in the somatic nervous system to start motor neurons firing and control voluntary movements.
Acetylcholine receptors are blocked or destroyed by the immune system as a result of myasthenia gravis. The muscles are unable to operate correctly because they are not receiving the neurotransmitter. Muscles cannot contract without acetylcholine specifically. Myasthenia gravis symptoms might be moderate or severe.
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