ATI RN
Nervous System Multiple Choice Questions and Answers Questions
Question 1 of 5
The vagus nerve
Correct Answer: B
Rationale: The vagus nerve (CN X) arises from the medulla, with nucleus ambiguus fibers (shared with CN XI origins) for pharyngeal/laryngeal muscles. It doesn’t supply the diaphragm (phrenic nerve) or face.
Question 2 of 5
Regarding the optic pathways
Correct Answer: D
Rationale: Trochlear (CN IV) paralysis prevents downward gaze when the eye is adducted (superior oblique). Abducens (VI) paralysis causes medial deviation.
Question 3 of 5
Regarding the circle of Willis
Correct Answer: D
Rationale: The internal carotid artery gives off the ophthalmic artery before forming the circle of Willis.
Question 4 of 5
What is a common neurotransmitter?
Correct Answer: D
Rationale: Acetylcholine (muscle/nerve communication), GABA (inhibitory), and serotonin (mood regulation) are all common neurotransmitters. 'All of the above' is correct as they are widely recognized examples.
Question 5 of 5
A neurotransmitter liberated by many peripheral nervous system neurons and some central nervous system neurons. It is excitatory at neuromuscular junctions but inhibitory at some other synapses.
Correct Answer: C
Rationale: Acetylcholine (ACh) is a neurotransmitter used by PNS motor neurons (excitatory at neuromuscular junctions) and some CNS neurons (can be inhibitory, e.g., in the heart). Neurotransmitter receptors receive signals, satellite cells support PNS neurons, and epinephrine is a hormone.