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A radioactive element is injected into a patient which preferentially accumulates in parasympathetic ganglia. Where will the signal be the highest?

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Correct Answer: D. Bladder
The parasympathetic fibers travel mainly through the vagus nerves and the anterior roots of the sacral segments of the spinal cord. They are not as extensively distributed in the body as the sympathetic fibers and their ganglia (= collection of nerve cell bodies outside the CNS, eliminating answer choice B.) are located near or within the visceral organs. From the answer choices provided, the bladder is the only organ innervated by the parasympathetic system. Recall that the parasympathetic system is important in the ‘vegetative responses’ of the body.
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