ATI RN
Autonomic Nervous System NCLEX Questions Questions
Question 1 of 5
Which part of a neuron contains the nucleus?
Correct Answer: B
Rationale: The soma, or cell body, of a neuron contains the nucleus, which houses the cell’s genetic material. Dendrites receive signals, axons transmit them, and the synaptic end bulb releases neurotransmitters, but only the soma contains the nucleus.
Question 2 of 5
How much of a change in the membrane potential is necessary for the summation of postsynaptic potentials to result in an action potential being generated?
Correct Answer: B
Rationale: From a resting potential of -70 mV, the membrane must depolarize to the threshold (around -55 mV), a change of about +15 mV, to trigger an action potential via summation.
Question 3 of 5
The brain stem does NOT include the:
Correct Answer: A
Rationale: The brainstem includes the midbrain, pons, and medulla oblongata. The diencephalon (thalamus, hypothalamus) is part of the forebrain, not the brainstem.
Question 4 of 5
Which structure is encircled by the circle of Willis?
Correct Answer: D
Rationale: The circle of Willis, an arterial ring at the brain’s base, encircles the pituitary stalk (infundibulum), providing blood to the brain. The cavernous sinus, pineal gland, and aqueduct are not within its structure.
Question 5 of 5
With regard to dermatomal nerve supply:
Correct Answer: A
Rationale: C7 supplies the index finger dermatome. The axial line separates C5/C6 (anterior/posterior), T4 is at the nipple, and T10 supplies the umbilicus.