ATI RN
Questions About the Nervous System Questions
Question 1 of 5
Which of the following toxins blocks Sodium Channels?
Correct Answer: C
Rationale: Tetrodotoxin (from pufferfish) blocks voltage-gated Na+ channels, halting action potentials. Strychnine blocks glycine, neostigmine inhibits acetylcholinesterase, curare blocks nicotinic receptors.
Question 2 of 5
The ___ is the innermost meningeal layer, clings tightly to the surface of the brain and spinal cord, following every fold.
Correct Answer: B
Rationale: The pia mater is the innermost meningeal layer, adhering closely to the brain and spinal cord. The arachnoid mater is the middle layer, dura mater the outermost, and tentorium cerebelli is a dura extension.
Question 3 of 5
The cell bodies of the preganglionic neurons of the sympathetic division are located within the:
Correct Answer: C
Rationale: Sympathetic preganglionic cell bodies are in the lateral horns of thoracic and lumbar (T1-L2) spinal cord gray matter, not cervical/sacral (parasympathetic) or white matter.
Question 4 of 5
The largest of the paravertebral ganglia, which carries sympathetic impulses to the eye, salivary glands, and mucosa of the mouth, is the:
Correct Answer: A
Rationale: The superior cervical ganglion supplies sympathetic innervation to the head (eye, salivary glands, mucosa). Celiac and mesenteric serve abdominal organs, stellate is lower.
Question 5 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.