ATI RN
Nervous System Questions Questions
Question 1 of 5
What does a ligand-gated channel require in order to open?
Correct Answer: B
Rationale: Ligand-gated channels open when a neurotransmitter (ligand) binds to them, allowing ions to flow. Voltage-gated channels respond to depolarization, not ligand-gated ones.
Question 2 of 5
Which midbrain cells are involved in general light reflexes?
Correct Answer: B
Rationale: The superior colliculus in the midbrain coordinates visual reflexes, including light reflexes (e.g., pupillary response via pretectal nuclei). The red nucleus and substantia nigra are motor-related, and the inferior colliculus processes sound.
Question 3 of 5
The lumbar plexus
Correct Answer: D
Rationale: The lumbar plexus (L1-L4) forms the femoral nerve from L2-L3-L4, innervating thigh muscles. It’s lateral to the inferior vena cava, formed from anterior rami, and includes more than the last three lumbar nerves.
Question 4 of 5
The motor nuclei of the facial nerve are situated in the
Correct Answer: D
Rationale: The facial nerve (CN VII) motor nucleus is in the pons, controlling facial muscles. The midbrain houses CN III/IV nuclei, and the cerebellum coordinates movement.
Question 5 of 5
corneal sensation synapses in which ganglion?
Correct Answer: D
Rationale: Corneal sensation (via ophthalmic nerve, V1) synapses in the trigeminal ganglion, the sensory root of CN V.