ATI RN
Nervous System Multiple Choice Questions and Answers Questions
Question 1 of 5
In a resting neuron, the:
Correct Answer: B
Rationale: At rest (~-70 mV), the neuron’s outside is positively charged (more Na⁺) and inside negatively charged (more K⁺), creating a potential difference. The membrane has selective permeability.
Question 2 of 5
The general depolarization toward threshold of a cell membrane when excitatory synaptic activities predominate is known as:
Correct Answer: D
Rationale: Facilitation is the process where excitatory inputs depolarize a neuron toward threshold, enhancing the likelihood of an action potential. ‘Facultation’ is a typo.
Question 3 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 4 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 5 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.