ATI RN
Autonomic Nervous System NCLEX Questions Questions
Question 1 of 5
A channel that opens in response to the binding of a molecule like a neurotransmitter is known as a
Correct Answer: C
Rationale: A ligand-gated channel opens when a molecule (e.g., neurotransmitter) binds, as in synapses. Mechanically gated respond to physical stimuli, leakage are always open, and voltage-gated to voltage.
Question 2 of 5
A bundle of axons in the central nervous system is a:
Correct Answer: D
Rationale: A tract is a bundle of axons in the CNS (e.g., corticospinal tract). Nerves are PNS axon bundles, cell bodies are soma, and neuroglia support.
Question 3 of 5
Which of the following is NOT true of the resting potential of a neuron?
Correct Answer: C
Rationale: At resting potential (~-70 mV), the inside is negatively charged with abundant potassium (K+), not sodium (Na+), which is outside. The membrane is polarized, and the outside is positive.
Question 4 of 5
What ion is necessary to cause the release of neurotransmitters from the synaptic vesicles?
Correct Answer: B
Rationale: Calcium (Ca2+) influx into the axon terminal triggers neurotransmitter release from synaptic vesicles.
Question 5 of 5
The ventral root of the spinal cord contains fibers and the dorsal root of the spinal cord contains fibers.
Correct Answer: B
Rationale: Ventral roots carry motor (efferent) fibers to muscles; dorsal roots carry sensory (afferent) fibers to the CNS.