ATI RN
Autonomic Nervous System NCLEX Questions Questions
Question 1 of 5
Many cardiac arrhythmias are due to improper regulation of the autonomic nervous system (ANS). Which of the following could be a cause of cardiac arrhythmia that arises from the ANS?
Correct Answer: C
Rationale: The vagus nerve (CN X, parasympathetic) slows heart rate; its failure can cause arrhythmias (e.g., tachycardia). Accessory nerve (XI) is motor, gap junctions are structural, and somatic neurons don’t innervate the heart.
Question 2 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 3 of 5
The three cutaneous nerves that pierce the deep fascia at the middle of the posterior border of the sternocleidomastoid include all the following, EXCEPT the
Correct Answer: D
Rationale: The lesser occipital, greater auricular, and transverse cervical nerves (all from the cervical plexus, C2-C4) pierce the deep fascia at the posterior border of the sternocleidomastoid to supply the neck and scalp. The supraclavicular nerve (C3-C4) emerges lower, near the clavicle, and does not pierce at this midpoint, making it the exception.
Question 4 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 5 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.