ATI RN
Nervous System Multiple Choice Questions and Answers Questions
Question 1 of 5
A neuroglial cell that supports neurons and produces a myelin sheath around axons of neurons of the central nervous system.
Correct Answer: A
Rationale: Oligodendrocytes in the CNS myelinate axons, supporting signal conduction. ACh is a neurotransmitter, white matter is axons, and action potential is a signal.
Question 2 of 5
An electrical signal that propagates along the membrane of a neuron or muscle fiber; a rapid change in membrane potential that involves a depolarization followed by a repolarization.
Correct Answer: A
Rationale: An action potential (AP) is the electrical signal (depolarization-repolarization) in neurons or muscles. Nerve and muscle action potentials are specific types, and synaptic potential is graded.
Question 3 of 5
One of the two main subdivisions of the autonomic nervous system; prepares the body for intense physical activity.
Correct Answer: A
Rationale: The sympathetic nervous system prepares the body for fight-or-flight (intense activity). Parasympathetic conserves energy, ANS is broader, and enteric controls digestion.
Question 4 of 5
Degeneration of the portion of the axon and myelin sheath of a neuron distal to the site of injury.
Correct Answer: D
Rationale: Wallerian degeneration is the breakdown of the axon and myelin distal to an injury in the PNS. Astrocytes are glia, motor neurons are cells, and action potentials are signals.
Question 5 of 5
The type of circuit in which branches of postsynaptic neurons synapse with earlier neurons in the path.
Correct Answer: C
Rationale: A reverberating circuit involves postsynaptic neurons feeding back to earlier neurons, creating sustained activity. Convergent and divergent describe synapse patterns, and parallel is not standard.