ATI RN
Test Questions on Autonomic Nervous System MCAT Questions
Question 1 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 2 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 3 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 4 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.
Question 5 of 5
The optic (II) nerve emerges from the brain; therefore, it is a type of
Correct Answer: C
Rationale: The optic nerve (CN II) emerges from the brain, making it a cranial nerve, transmitting visual information. Spinal nerves exit the spinal cord, somatic is a functional term, and enteric is digestive.