ATI RN
Nervous System Questions Questions
Question 1 of 5
The brain and spinal cord.
Correct Answer: A
Rationale: The central nervous system (CNS) comprises the brain and spinal cord. White matter is axons, interneurons are neurons, and gray matter is cell bodies.
Question 2 of 5
The narrow gap at a chemical synapse that separates the axon terminal of one neuron from another neuron or muscle fiber and across which a neurotransmitter diffuses to affect the postsynaptic cell.
Correct Answer: B
Rationale: The synaptic cleft is the gap at a chemical synapse where neurotransmitters diffuse to the postsynaptic cell. Ganglion is a cell body cluster, neurotransmitter is a chemical, and synaptic vesicles store it.
Question 3 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 4 of 5
Abnormal fluid accumulation in the lungs would be detected during breathing by
Correct Answer: B
Rationale: Auscultation (listening with a stethoscope) detects abnormal lung sounds (e.g., crackles) from fluid accumulation. Percussion assesses density, inspection is visual, and palpation is touch.
Question 5 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.