ATI RN
Nervous System Multiple Choice Questions and Answers Questions
Question 1 of 5
The arrival on a given neuron of a series of impulses from a series of terminal axons, resulting in an action potential, is an example of:
Correct Answer: D
Rationale: Spatial summation occurs when multiple presynaptic inputs (from different axons) collectively depolarize a neuron to threshold, triggering an action potential. Temporal summation involves rapid single-source inputs.
Question 2 of 5
A client has been prescribed a drug that is classified as a beta-adrenergic blocker for control of hypertension. Recalling the underlying physiology, the nurse is aware that this drug functions by blocking the action of which neurotransmitter?
Correct Answer: D
Rationale: Beta-adrenergic blockers inhibit norepinephrine (and epinephrine) at beta receptors (e.g., β₁ in heart), reducing BP. Acetylcholine is cholinergic, serotonin/GABA are CNS transmitters.
Question 3 of 5
A client is examined by a nurse who is assessing the client's ability to move the eyes. Which set of cranial nerves will the nurse examine?
Correct Answer: C
Rationale: Eye movement is controlled by CN III (oculomotor), IV (trochlear), and VI (abducens). CN I (olfactory), II (optic), and VII (facial) handle smell, vision, and facial muscles.
Question 4 of 5
The white matter of the CNS is always:
Correct Answer: C
Rationale: White matter in the CNS consists of myelinated axons organized into tracts that carry signals between regions. It is not always deep to gray matter (e.g., cerebral cortex has superficial gray matter), it is myelinated (not unmyelinated), and it includes both sensory and motor fibers, not just sensory.
Question 5 of 5
Which lobe-function pairing is incorrect?
Correct Answer: A
Rationale: The frontal lobe handles motor functions and planning, not sensory interpretation (done by the parietal lobe’s somatosensory cortex). Parietal does somatesthetic interpretation, occipital manages vision, and temporal handles memory and audition.