ATI RN
Questions About the Nervous System Questions
Question 1 of 5
Which of the following is NOT true of the parasympathetic nervous system?
Correct Answer: C
Rationale: The parasympathetic system uses acetylcholine only, not norepinephrine (sympathetic). It has long preganglionic and short postganglionic neurons, cranial/sacral origins, and rest-and-digest function.
Question 2 of 5
Clusters of cell bodies in the peripheral nervous system are known as:
Correct Answer: B
Rationale: Ganglia are clusters of cell bodies in the PNS (e.g., dorsal root ganglia). Nuclei are CNS clusters, tracts are axon bundles, and D is incomplete.
Question 3 of 5
The myelin sheath produced by Schwann cells functions to:
Correct Answer: D
Rationale: Myelin increases conduction speed via saltatory conduction. Transmission is axonal, protection partial, and neurotransmitter regulation is synaptic.
Question 4 of 5
During the resting state of a neuron, the membrane is primarily permeable to:
Correct Answer: B
Rationale: At rest (~-70 mV), the membrane is most permeable to potassium (K+) via leak channels, maintaining negative charge inside.
Question 5 of 5
Saltatory conduction occurs in myelinated axons and involves:
Correct Answer: B
Rationale: Saltatory conduction is rapid jumping between nodes, enhancing speed. Continuous is unmyelinated, slow isn’t typical, bidirectional rare.