ATI RN
Test Questions on Autonomic Nervous System MCAT Questions
Question 1 of 5
An acute demyelinating disorder in which macrophages strip myelin from axons in the PNS.
Correct Answer: B
Rationale: Guillain-Barré syndrome (GBS) is a PNS demyelinating disorder causing paralysis. Parasympathetic is a system, PNS is broader, and neuropathy is a general term.
Question 2 of 5
The resting membrane potential in most neurons is about -70 mV. What does this tell you?
Correct Answer: B
Rationale: A resting membrane potential of -70 mV means the inside of the neuron is more negative (due to K+ and anions) than the outside (Na+ dominant), maintained by the sodium-potassium pump.
Question 3 of 5
Which of the parts of nervous tissue transmits an action potential?
Correct Answer: A
Rationale: The axon transmits action potentials to other cells. Cell body and dendrites process signals, and neuroglia support but don’t conduct.
Question 4 of 5
The optic (II) nerve emerges from the brain; therefore, it is a type of
Correct Answer: C
Rationale: The optic nerve (CN II) emerges from the brain, making it a cranial nerve, transmitting visual information. Spinal nerves exit the spinal cord, somatic is a functional term, and enteric is digestive.
Question 5 of 5
Which of the following is an effector of the autonomic nervous system?
Correct Answer: D
Rationale: Salivary glands, heart, and pancreas are effectors of the ANS, regulated involuntarily (e.g., salivation, heart rate, insulin release). 'All of these' is correct.