ATI RN
Questions About the Nervous System Questions
Question 1 of 5
The neuronal Nissl bodies are
Correct Answer: B
Rationale: Nissl bodies are rough endoplasmic reticulum in neurons, synthesizing proteins. Mitochondria produce energy, lysosomes degrade waste, and Golgi processes proteins.
Question 2 of 5
Neuron A has a diameter that is twice that of Neuron B. Based only on this information, which of the following is true?
Correct Answer: C
Rationale: Larger diameter axons (Neuron A) have lower resistance, transmitting action potentials faster. Strength is all-or-none, not diameter-dependent.
Question 3 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 4 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 5 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.