ATI RN
Test Questions on Autonomic Nervous System MCAT Questions
Question 1 of 5
Which of the following is NOT related to the sympathetic division of the autonomic nervous system?
Correct Answer: D
Rationale: The sympathetic division (fight-or-flight) originates from thoracic/lumbar regions with long postganglionic fibers, but digestion is primarily parasympathetic (rest-and-digest).
Question 2 of 5
The nodes of Ranvier are found on:
Correct Answer: A
Rationale: Nodes of Ranvier are gaps in the myelin sheath on axons, aiding rapid conduction. Axon hillock initiates, terminals release neurotransmitters, and unmyelinated axons lack nodes.
Question 3 of 5
Which type of neuron is responsible for connecting sensory and motor neurons?
Correct Answer: B
Rationale: Interneurons connect sensory and motor neurons within the CNS. Motor neurons signal effectors, sensory neurons detect stimuli, and 'mixed' isn’t standard. (Q18 incomplete, assumed.)
Question 4 of 5
Saltatory conduction in myelinated axons involves:
Correct Answer: B
Rationale: Saltatory conduction is impulse 'jumping' between nodes of Ranvier, speeding transmission. Continuous is unmyelinated, slow isn’t typical, bidirectional is rare.
Question 5 of 5
The undershoot or afterhyperpolarization phase of an action potential is mainly due to:
Correct Answer: B
Rationale: Afterhyperpolarization occurs as K+ continues exiting, overshooting rest potential. Na+ influx stops earlier, Ca2+ is synaptic, Cl- minimal.