ATI RN
Test Questions on Autonomic Nervous System Questions
Question 1 of 5
Which of the following does NOT describe the autonomic nervous system?
Correct Answer: C
Rationale: The autonomic nervous system (ANS) uses two neurons (pre- and postganglionic) and a ganglion, not one. It is involuntary, serves organs, and has sympathetic/parasympathetic divisions.
Question 2 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 3 of 5
Bipolar neurons are commonly found in the:
Correct Answer: B
Rationale: Bipolar neurons, with one dendrite and one axon, are in sensory organs like the retina. Spinal cord has multipolar, muscles/skin lack neurons.
Question 4 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 5 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.