ATI RN
Nervous System Multiple Choice Questions and Answers Questions
Question 1 of 5
Which spinal nerve branch is NOT correctly matched with the area it serves?
Correct Answer: A
Rationale: The phrenic nerve (C3-C5) serves the diaphragm, not abdominal muscles. Radial, femoral, and sciatic are correctly matched.
Question 2 of 5
The rapid reversal of electrical potential along the membrane of a neuron is called:
Correct Answer: A
Rationale: An action potential is the rapid depolarization and repolarization of a neuron’s membrane during impulse transmission. Resting potential is the stable state, others are synaptic effects.
Question 3 of 5
In the central nervous system, clusters of cell bodies are called:
Correct Answer: A
Rationale: Nuclei are clusters of cell bodies in the CNS (e.g., basal nuclei). Ganglia are PNS, tracts are axons, and nerves are PNS bundles.
Question 4 of 5
In the peripheral nervous system, Schwann cells wrap around the:
Correct Answer: C
Rationale: Schwann cells wrap around axons in the PNS to form myelin. Axon hillock and cell body are unmyelinated, dendrites rarely myelinated. (Answer corrected from 'nodes' to 'axon' based on context.)
Question 5 of 5
The initial stimulus for an action potential causes a brief influx of:
Correct Answer: A
Rationale: A stimulus opens sodium (Na+) channels, causing Na+ influx to depolarize the membrane and trigger an action potential.