ATI RN
Nervous System Questions Questions
Question 1 of 5
In a myelinated axon, where are the action potentials regenerated?
Correct Answer: A
Rationale: Action potentials regenerate at nodes of Ranvier in myelinated axons (saltatory conduction). Axon hillock starts them, terminals end them, myelin insulates.
Question 2 of 5
In case of peripheral nerve injury, Schwann cells play a role in:
Correct Answer: C
Rationale: Schwann cells promote axon regeneration by clearing debris and forming growth paths. They don’t inhibit or trigger apoptosis.
Question 3 of 5
The refractory period following an action potential is important for:
Correct Answer: C
Rationale: The refractory period (absolute/relative) prevents new action potentials, ensuring unidirectional flow. Pump restores ions, Ca2+ aids release.
Question 4 of 5
The reuptake of neurotransmitters back into the presynaptic neuron is facilitated by:
Correct Answer: C
Rationale: Reuptake transporters (e.g., SERT) recycle neurotransmitters into the presynaptic neuron. Vesicles store, junctions conduct, receptors bind.
Question 5 of 5
Cerebrospinal fluid (CSF) is produced by the choroid plexuses and circulates through the ventricles and the subarachnoid space, providing:
Correct Answer: A
Rationale: CSF cushions and supports the brain. Oxygen is via blood, signals are neuronal, taste is unrelated.