Your Friend Has a Paralyzed Arm

Your friend has a paralyzed arm. What physical events might have caused this?

A) Any of these events could have caused the paralysis: damage to the part of the brain that controls that arm, damage to the part of the spinal cord that controls that arm, or drug- induced failure at the neuromuscular junction.
B) damage to the part of the brain that controls that arm
C) damage to the part of the spinal cord that controls that arm
D) drug- induced failure at the neuromuscular junction