Final answer:
In a myasthenia crisis, a patient experiences severe muscle weakness, including the muscles that control breathing. Emergency medical care and assisted ventilation are required to sustain life.
Step-by-step explanation:
In a myasthenia crisis, a patient experiences severe muscle weakness, including the muscles that control breathing. It is a life-threatening condition that requires emergency medical care to provide assisted ventilation and sustain life. Treatment for myasthenia crisis may involve medications to counter the effects of the mutated gene or suppress the immune system.