ATI RN
Test Questions on Autonomic Nervous System MCAT Questions
Question 1 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 2 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 3 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.
Question 4 of 5
Identify the neural cell or part of a neuron that cannot conduct impulses.
Correct Answer: D
Rationale: Neuroglia support neurons but cannot conduct impulses. Axon, cell body, and dendrites participate in signal conduction.
Question 5 of 5
What gives gray matter its grayish color?
Correct Answer: C
Rationale: Gray matter’s grayish color comes from neuronal cell bodies and unmyelinated axons/dendrites, lacking myelin’s white sheen. Myelinated axons are white matter.