ATI RN
Nervous System Questions Questions
Question 1 of 5
A channel that opens in response to physical distortion of the membrane.
Correct Answer: D
Rationale: A mechanically gated channel opens due to physical stimuli (e.g., pressure, stretch), as in touch receptors. Voltage-gated respond to voltage, ligand-gated to neurotransmitters, and leak channels are always open.
Question 2 of 5
In the brain, this surrounds the white matter.
Correct Answer: C
Rationale: Gray matter (neuronal cell bodies, dendrites) surrounds white matter (axons) in the brain’s cortex. Ganglia are PNS, and dendrites are neuron parts.
Question 3 of 5
Motor neurons from the hypoglossal (XII) nerve innervate the tongue. Destruction of these motor neurons due to traumatic injury would result in the loss of a(n)
Correct Answer: A
Rationale: Hypoglossal (CN XII) motor neurons innervate tongue muscles (effectors). Their destruction impairs tongue movement, not sensory, integration, or CNS pathways.
Question 4 of 5
Which part of a neuron conducts nerve impulses to another cell?
Correct Answer: A
Rationale: Synaptic ends (terminals) release neurotransmitters to signal another cell, concluding the axon’s impulse conduction. Axon conducts, dendrites receive, and cell body processes.
Question 5 of 5
What comprises gray matter?
Correct Answer: C
Rationale: Gray matter comprises neuronal cell bodies, dendrites, and unmyelinated axons, forming CNS regions like the cortex. Myelinated axons are white matter.