ATI RN
Questions About the Nervous System Questions
Question 1 of 5
Which class of drugs may be used to treat bronchial asthma?
Correct Answer: C
Rationale: Adrenergic drugs (e.g., β₂ agonists like albuterol) dilate bronchi to treat asthma. Cholinergics constrict, anticholinesterases enhance acetylcholine, blockers inhibit dilation.
Question 2 of 5
Which of the following is not a plexus of the spinal nerves?
Correct Answer: C
Rationale: Choroid is not a spinal nerve plexus (it’s a CSF-producing structure). Cervical, sacral, brachial, and lumbar are plexuses.
Question 3 of 5
At a synapse, impulse conduction normally:
Correct Answer: B
Rationale: Synaptic transmission is unidirectional (presynaptic to postsynaptic) due to vesicle release and receptor orientation. Neurotransmitters like acetylcholine or epinephrine may be involved but aren’t sole determinants.
Question 4 of 5
During repolarization of the neuronal membrane:
Correct Answer: C
Rationale: Repolarization occurs when potassium (K⁺) exits via voltage-gated channels, restoring the negative interior after Na⁺ influx depolarizes.
Question 5 of 5
An IPSP is believed to cause:
Correct Answer: D
Rationale: An inhibitory postsynaptic potential (IPSP) increases permeability to K⁺ (efflux) and Cl⁻ (influx), hyperpolarizing the membrane to inhibit action potentials.