ATI RN
Autonomic Nervous System NCLEX Questions Questions
Question 1 of 5
Which sequence of a reflex arc is correct?
Correct Answer: A
Rationale: A reflex arc sequence is: receptor (detects stimulus), sensory neuron (to CNS), interneuron (integration), motor neuron (to effector), effector (response).
Question 2 of 5
Which type of axon conducts nerve impulses at the fastest speed?
Correct Answer: D
Rationale: Large-diameter, myelinated axons conduct fastest due to size (less resistance) and myelination (saltatory conduction). Smaller/unmyelinated axons are slower.
Question 3 of 5
Multipolar neurons have:
Correct Answer: B
Rationale: Multipolar neurons (e.g., motor neurons) have multiple dendrites and one axon. A is bipolar, C is rare, and D repeats B.
Question 4 of 5
In the central nervous system, the equivalent of Schwann cells are called:
Correct Answer: C
Rationale: Oligodendrocytes myelinate CNS axons, like Schwann cells in PNS. Satellite cells support PNS cell bodies, astrocytes nourish, microglia are immune.
Question 5 of 5
The threshold potential is the membrane potential at which:
Correct Answer: A
Rationale: Threshold (~-55 mV) is the potential where Na+ channels open fully, triggering an action potential. Rest is ~-70 mV, hyperpolarization follows.