ATI LPN
Medical Surgical Neurology Questions
Question 1 of 5
The fatty substance that insulates and speeds up the conduction of nerve impulses along the axon is called:
Correct Answer: B
Rationale: Myelin insulates axons and speeds conduction via saltatory conduction. Others are unrelated. [Level: Knowledge]
Question 2 of 5
The threshold potential is the membrane potential at which:
Correct Answer: A
Rationale: Threshold (~-55 mV) triggers Na+ channel opening, initiating an action potential. [Level: Knowledge]
Question 3 of 5
The reuptake of neurotransmitters back into the presynaptic neuron is facilitated by:
Correct Answer: D
Rationale: Reuptake transporters recycle neurotransmitters, terminating their action. [Level: Knowledge]
Question 4 of 5
The largest nerve in the human body, the sciatic nerve, is an example of a:
Correct Answer: C
Rationale: The sciatic nerve carries both sensory and motor fibers, making it mixed. [Level: Knowledge]
Question 5 of 5
The outermost layer of the meninges, providing protection and cushioning for the brain, is called the:
Correct Answer: B
Rationale: The dura mater is the tough, outermost meningeal layer, protecting the CNS. [Level: Knowledge]