ATI RN
Test Questions on Autonomic Nervous System MCAT Questions
Question 1 of 5
A neuron that propagates nerve impulses toward a synapse.
Correct Answer: B
Rationale: The presynaptic neuron sends nerve impulses toward a synapse, releasing neurotransmitters. Postsynaptic neurons receive signals, enteric plexuses are digestive, and synaptic end bulbs are axon parts.
Question 2 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 3 of 5
The breakdown of Nissl bodies into finely granular masses in the cell body of a neuron whose axon has been damaged.
Correct Answer: B
Rationale: Chromatolysis is the breakdown of Nissl bodies (rough ER) in a neuron’s cell body after axon injury, indicating repair. Dendrites are neuron parts, neurology is a field, and satellite cells are PNS glia.
Question 4 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 5 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.