ATI RN
Questions About the Nervous System Questions
Question 1 of 5
Which spinal nerve region and the number of nerve pairs is NOT correct?
Correct Answer: B
Rationale: Cervical has 8 pairs (C1-C8), not 7. Lumbar (5), thoracic (12), and sacral (5) are correct.
Question 2 of 5
Which type of neuron carries signals from sensory receptors to the central nervous system (CNS)?
Correct Answer: C
Rationale: Sensory neurons (afferent) carry signals from receptors to the CNS. Motor neurons (efferent) signal effectors, interneurons connect within CNS, and 'mixed' isn’t a standard type.
Question 3 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 4 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 5 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.