ATI RN
Test Questions on Autonomic Nervous System MCAT Questions
Question 1 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 2 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 3 of 5
All of the following statements are true concerning the middle meningeal artery, EXCEPT
Correct Answer: A
Rationale: The middle meningeal artery enters the cranial cavity through the foramen spinosum, not the foramen ovale (which transmits CN V3). It supplies the dura mater (not pia/arachnoid), grooves the skull’s inner table (e.g., squamous temporal bone), and its rupture causes extradural hematoma, making A the false statement.
Question 4 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 5 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.