ATI RN
Test Questions on Autonomic Nervous System Questions
Question 1 of 5
Which part of the neuron conducts nerve impulses?
Correct Answer: A
Rationale: The axon conducts nerve impulses away from the cell body. Dendrites receive, synapses connect, and the nucleus controls cell function.
Question 2 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 3 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 4 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 5 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.