ATI RN
Nervous System Multiple Choice Questions and Answers Questions
Question 1 of 5
Of the following statements about the parasympathetic division of the ANS: (i) all its neurons release acetylcholine as their primary neurotransmitter substance; (ii) the cell bodies of its postganglionic neurons lie in or near the organ innervated; (iii) the cell bodies of its preganglionic neurons lie in the cervical and sacral spinal cord; one would say that:
Correct Answer: C
Rationale: (i) True: Parasympathetic uses acetylcholine. (ii) True: Postganglionic neurons are near organs. (iii) False: Preganglionic neurons are in brainstem (cranial nerves) and sacral cord, not cervical.
Question 2 of 5
Taste sensation is mediated by cranial nerves:
Correct Answer: C
Rationale: Facial (VII) mediates anterior tongue taste, glossopharyngeal (IX) posterior tongue. Trigeminal is sensory, trochlear/abducens are eye-related.
Question 3 of 5
Which kind of neuroglial cells are not found in the CNS?
Correct Answer: D
Rationale: Satellite cells are found in the peripheral nervous system (PNS), supporting neuron cell bodies in ganglia. All others (astrocytes, ependymal cells, microglia, oligodendrocytes) are CNS glial cells.
Question 4 of 5
In a resting neuron, the:
Correct Answer: B
Rationale: At rest (~-70 mV), the neuron’s outside is positively charged (more Na⁺) and inside negatively charged (more K⁺), creating a potential difference. The membrane has selective permeability.
Question 5 of 5
The arrival on a given neuron of a series of impulses from a series of terminal axons, resulting in an action potential, is an example of:
Correct Answer: D
Rationale: Spatial summation occurs when multiple presynaptic inputs (from different axons) collectively depolarize a neuron to threshold, triggering an action potential. Temporal summation involves rapid single-source inputs.