ATI RN
Questions About Nervous System Questions
Question 1 of 5
What is the primary structural and functional unit of the nervous system?
Correct Answer: B
Rationale: The neuron is the primary structural and functional unit of the nervous system, responsible for signal transmission. Neurotransmitters are chemicals, neuroglia support, and 'nerew' is a typo for nerve.
Question 2 of 5
Which part of a neuron contains the nucleus and most of the cell's organelles?
Correct Answer: D
Rationale: The cell body (soma) contains the nucleus and organelles, integrating signals. Axon conducts, dendrite receives, and axon hillock initiates.
Question 3 of 5
Schwann cells play a crucial role in the process of:
Correct Answer: D
Rationale: Schwann cells aid peripheral nerve regeneration by clearing debris and guiding regrowth. Synaptic transmission is chemical, transport is axonal, neurogenesis is CNS.
Question 4 of 5
The rapid depolarization phase of an action potential is primarily due to:
Correct Answer: B
Rationale: Depolarization occurs due to Na+ influx through voltage-gated channels. K+ efflux is repolarization, Ca2+ is synaptic.
Question 5 of 5
The small gap between the presynaptic and postsynaptic neurons is known as the:
Correct Answer: B
Rationale: The synaptic cleft is the gap where neurotransmitters diffuse. Vesicles store, transporters reuptake, receptors bind. (Q37 options incomplete, corrected.)