ATI RN
Questions About the Nervous System Questions
Question 1 of 5
If the axon of a neuron were destroyed, which of the following would happen to the neuron?
Correct Answer: A
Rationale: The axon transmits action potentials; its destruction prevents signal propagation. Neurons have one axon, and dendrites receive stimuli, so only transmission is affected.
Question 2 of 5
A defect in forming which of the following would mean neurons could not be properly supported by astrocytes?
Correct Answer: C
Rationale: Astrocytes help form and maintain the blood-brain barrier, supporting neurons by regulating blood-neuron interactions. Myelin is from oligodendrocytes, neurofibrils are structural, and synapses are junctions.
Question 3 of 5
Neurons that transmit nerve impulses from receptors to the central nervous system are neurons.
Correct Answer: C
Rationale: Sensory neurons (afferent) transmit impulses from receptors to the CNS. Interneurons connect within the CNS, motor neurons (efferent) signal effectors, and unipolar is a structural type.
Question 4 of 5
The myelin sheath around axons in the CNS is formed by
Correct Answer: C
Rationale: Oligodendrocytes form myelin sheaths around CNS axons. Schwann cells myelinate PNS axons, neurons conduct, and 'none' is incorrect.
Question 5 of 5
The return of the neuron cell membrane to resting potential is called
Correct Answer: D
Rationale: Repolarization restores resting potential (~-70 mV) via K+ efflux after depolarization. Synaptic transmission is communication, polarization is resting, and depolarization is Na+ influx.