A person has difficulty extending their left elbow. What spinal nerve concerns you?

1. What type of channel is required for action potentials to open? Is it ligand-gated or voltage-gated?
2. Are alphamotor neurons necessary for sensory information to be received by the spinal cord or for motor information to leave the spinal cord?
3. What can trigger an end-plate potential? Is it the opening of more sodium channels, the opening of more potassium channels, the release of acetylcholine, or the docking of synaptic vesicles?
4. Which of the following actions will the anterior muscles of the arm not perform? Will they not flex the wrist, flex the arm at the shoulder joint, flex the arm at the elbow joint, or rotate the humerus?

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