ATI RN
Nervous System Multiple Choice Questions and Answers Questions
Question 1 of 5
Nerves that directly innervate voluntary muscles are part of the
Correct Answer: B
Rationale: The somatic nervous system innervates voluntary skeletal muscles. Autonomic controls involuntary muscles/glands, CNS is brain/spinal cord, and enteric governs digestion.
Question 2 of 5
Which types of CNS neuroglia are the most similar in appearance?
Correct Answer: C
Rationale: Astrocytes (star-shaped) and oligodendrocytes (fewer processes) are similar in having branching processes, unlike microglia (small, mobile) or ependymal cells (ciliated, lining ventricles).
Question 3 of 5
Cells support and nourish cells that send electrical signals throughout the body.
Correct Answer: B
Rationale: Neuroglia (e.g., astrocytes, oligodendrocytes) support and nourish neurons, which send electrical signals. Effectors respond, and receptors detect stimuli.
Question 4 of 5
An electrical potential difference across the plasma membrane of a neuron is known as a(n)
Correct Answer: C
Rationale: The resting membrane potential (~-70 mV) is the voltage difference across a neuron’s membrane at rest, due to ion gradients. Action and graded potentials are dynamic, and electrochemical is a broader term.
Question 5 of 5
What gives white matter its white color?
Correct Answer: D
Rationale: White matter’s white color comes from myelin, the lipid-rich sheath around axons, reflecting light. Dendrites and cell bodies are gray matter, and Nissl bodies are in cell bodies.