ATI RN
Nervous System Questions Questions
Question 1 of 5
A cranial nerve that affects eye movement is the:
Correct Answer: C
Rationale: The trochlear nerve (IV) innervates the superior oblique muscle for eye movement. Optic is sensory, trigeminal is facial, hypoglossal is tongue.
Question 2 of 5
A transmitter substance released into the synaptic cleft is:
Correct Answer: B
Rationale: Acetylcholine is a key neurotransmitter released into the synaptic cleft. Cholinesterase degrades it, ATP may co-release, RNA is not a transmitter.
Question 3 of 5
The presence of myelin gives a nerve fiber its:
Correct Answer: B
Rationale: Myelin, a lipid-rich sheath, gives axons a white appearance and speeds impulse transmission via saltatory conduction. Gray matter lacks myelin, regeneration is PNS-specific (Schwann cells).
Question 4 of 5
The junction between the two neurons is called:
Correct Answer: C
Rationale: A synapse is the junction between neurons where signals pass chemically or electrically.
Question 5 of 5
The nurse is explaining the pathophysiology of multiple sclerosis to a client just diagnosed with this condition. As part of this explanation, the nurse teaches the client that the function of the myelin sheath is to:
Correct Answer: C
Rationale: Myelin insulates axons, enabling rapid, smooth impulse transmission via saltatory conduction. It doesn’t nourish cells, connect brain to periphery, or protect dendrites specifically.