ATI LPN
Medical Surgical Neurology Questions
Question 1 of 5
White matter refers to myelinated fibers in the:
Correct Answer: A
Rationale: White matter in the CNS consists of myelinated axons, giving it a white appearance, distinct from PNS structures or subsystems like ANS/SNS.
Question 2 of 5
What structure do retinal ganglion cells come from during development?
Correct Answer: D
Rationale: Retinal ganglion cells originate in the diencephalon, specifically the optic vesicle, which forms the retina.
Question 3 of 5
What happens in a photoreceptor cell (a rod, for example) in response to a light stimulus?
Correct Answer: C
Rationale: Light reduces cGMP, closing Na⁺ channels, hyperpolarizing photoreceptors by reducing cation influx.
Question 4 of 5
The opening of K+ channels produces a in hair cells because of the concentration of K+ in the endolymph and the endocochlear potential.
Correct Answer: D
Rationale: High K⁺ in endolymph and a positive endocochlear potential (~+80 mV) drive K⁺ influx, depolarizing hair cells when channels open.
Question 5 of 5
You pick up an ice cube. Which aspect of the ice do you notice first and why?
Correct Answer: A
Rationale: Temperature (cold) is sensed first via thin, slower-conducting C-fibers or Aδ fibers, compared to thicker, faster tactile fibers.