ATI RN
Test Questions on Autonomic Nervous System Questions
Question 1 of 5
The dorsal roots of spinal nerves contain:
Correct Answer: A
Rationale: Dorsal roots carry sensory (afferent) fibers only.
Question 2 of 5
Excessive polarization due to GABA is created due to the opening of channels.
Correct Answer: B
Rationale: GABA opens Cl- channels, causing hyperpolarization (inhibition) by Cl- influx. Ca++, K+, and Na+ are involved in other processes.
Question 3 of 5
The progression of a nerve impulse with the nodes of Ranvier is called:
Correct Answer: A
Rationale: Saltatory conduction is impulse jumping between nodes of Ranvier in myelinated axons, speeding transmission. Others are incorrect or vague.
Question 4 of 5
It is a type of nerve cell that protects CNS from infection and becomes phagocytic in response to inflammation:
Correct Answer: C
Rationale: Microglia are CNS immune cells that phagocytose debris and pathogens during inflammation. Schwann cells myelinate PNS axons, ependymal cells produce CSF, and astrocytes support the BBB.
Question 5 of 5
Most body organs are innervated by the:
Correct Answer: C
Rationale: Most organs receive dual innervation from both sympathetic and parasympathetic divisions of the ANS, with antagonistic effects (e.g., heart, lungs). CNS is not a division.