ALS is caused by the degeneration and death of motor neurons, the nerve cells which convey nerve impulses from the spinal cord to each of the body's muscles.
ALS是由运动神经元的变性和死亡而发生的,该运动神经元可将神经冲动从脊髓传达到身体的各块肌肉。
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The leading cause of death for firefighters often caused by asphyxiation and burns (20%), motor vehicle collisions (20-25%), trauma (27%) and heart attack (44%).