ATI RN
Test Questions on Autonomic Nervous System MCAT Questions
Question 1 of 5
Neuron whose axon extends only for a short distance and contacts nearby neurons in the brain, spinal cord, or a ganglion; comprise the vast majority of neurons in the body.
Correct Answer: D
Rationale: Interneurons connect neurons within the CNS or ganglia, forming most CNS neurons. Axon terminals end axons, convergence is a synapse pattern, and gray matter is tissue.
Question 2 of 5
An acute demyelinating disorder in which macrophages strip myelin from axons in the PNS.
Correct Answer: B
Rationale: Guillain-Barré syndrome (GBS) is a PNS demyelinating disorder causing paralysis. Parasympathetic is a system, PNS is broader, and neuropathy is a general term.
Question 3 of 5
A synaptic arrangement in which the synaptic end bulbs of one presynaptic neuron terminate on several postsynaptic neurons.
Correct Answer: B
Rationale: Divergence is when one presynaptic neuron synapses on multiple postsynaptic neurons, amplifying signals. Epinephrine is a hormone, microtubules are structural, and nerve fiber is an axon.
Question 4 of 5
The resting membrane potential in most neurons is about -70 mV. What does this tell you?
Correct Answer: B
Rationale: A resting membrane potential of -70 mV means the inside of the neuron is more negative (due to K+ and anions) than the outside (Na+ dominant), maintained by the sodium-potassium pump.
Question 5 of 5
Which of the parts of nervous tissue transmits an action potential?
Correct Answer: A
Rationale: The axon transmits action potentials to other cells. Cell body and dendrites process signals, and neuroglia support but don’t conduct.