Dan drinks a cup or two of strong coffee in the morning to help him wake up and get rid of his sleepiness. According to the In Focus box titled "What You Really Want to Know About Sleep," the common stimulant drug in coffee, caffeine, blocks receptors for a naturally occurring compound in the body called _____, thus promoting wakefulness.

Question

Quizplus · Accepted Answer

Adenosine is a natural compound in the body that accumulates while we are awake and promotes sleepiness. Caffeine blocks the receptors for adenosine, which then promotes wakefulness. None of the other answer choices are related to the effects of caffeine on wakefulness.

Dan Drinks a Cup or Two of Strong Coffee in the Morning