ATI RN
Test Questions on Autonomic Nervous System MCAT Questions
Question 1 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.
Question 2 of 5
Chemical messengers that allow neurons to communicate with other cells are called:
Correct Answer: C
Rationale: Neurotransmitters (e.g., acetylcholine) are chemicals released at synapses for communication. Axons conduct, myelin insulates, and neuroglia support.
Question 3 of 5
A stimulus will begin an action potential by
Correct Answer: A
Rationale: A stimulus depolarizes the membrane by opening sodium (Na+) channels, allowing Na+ influx to trigger an action potential.
Question 4 of 5
Identify the layers of the meninges in order from deepest to most superficial.
Correct Answer: B
Rationale: Meninges order is pia mater (deepest), arachnoid mater, dura mater (superficial). Option B is correct: dura, arachnoid, pia is reversed.
Question 5 of 5
The electrical activity of the brain is recorded in the form of a(n):
Correct Answer: B
Rationale: An electroencephalogram (EEG) records brain electrical activity. An electrocardiogram is for the heart, myelogram images the spinal cord, and neurogram is not standard.