ATI RN
Test Questions on Autonomic Nervous System Questions
Question 1 of 5
Axons that conduct nerve impulses away from the central nervous system are called:
Correct Answer: B
Rationale: Efferent axons (motor) carry impulses from CNS to effectors. Afferent axons (sensory) go to CNS, interneurons connect within, and 'relay' is a subtype.
Question 2 of 5
What is the function of the myelin sheath in nerve fibers?
Correct Answer: C
Rationale: Myelin facilitates conduction by enabling saltatory conduction, not preventing it. Resistance decreases, and neurotransmitter release is synaptic.
Question 3 of 5
Which phase of the action potential involves the efflux of potassium ions?
Correct Answer: D
Rationale: Repolarization involves K+ efflux, restoring the negative inside potential. Rising is Na+ influx, falling overlaps, overshoot is peak.
Question 4 of 5
What is the role of calcium ions in the process of neurotransmitter release?
Correct Answer: B
Rationale: Ca2+ influx triggers vesicle exocytosis, releasing neurotransmitters. It doesn’t inhibit or bind postsynaptically.
Question 5 of 5
The fourth ventricle is located between the pons and the cerebellum and is continuous with the central canal of the spinal cord and the:
Correct Answer: D
Rationale: The fourth ventricle connects to the spinal canal and exits CSF via the foramen magnum (subarachnoid space). Others are upstream.