Which of the following statements is true of caffeine?
A)It causes the release of melatonin by the adrenal glands.
B)It causes afferent nerves to transmit information away from the brain.
C)It affects the brain's pleasure centers.
D)It is a main psychoactive ingredient of smokeless tobacco.

Question

Quizplus · Accepted Answer

Caffeine affects the brain's pleasure centers by increasing the release of dopamine, a neurotransmitter associated with pleasure and reward. It does not cause the release of melatonin by the adrenal glands (A), nor does it affect afferent nerves (B). It is not a main psychoactive ingredient of smokeless tobacco (D), which typically contains nicotine.

Which of the Following Statements Is True of Caffeine