ATI RN
Test Questions on Autonomic Nervous System Questions
Question 1 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 2 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 3 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.
Question 4 of 5
Which of the following would not result from sympathetic stimulation?
Correct Answer: D
Rationale: Sympathetic stimulation promotes glycogenolysis, spleen contraction, and adrenal catecholamine release (fight-or-flight), but reduces salivary secretion (dry mouth). Profuse salivation is parasympathetic.
Question 5 of 5
Beta receptors are stimulated by:
Correct Answer: C
Rationale: Isoproterenol (isoproteranol) is a beta-adrenergic agonist, stimulating β receptors (e.g., heart, lungs). Methoxamine is α₁-specific, acetylcholine is cholinergic, atropine blocks muscarinic.