Dan drinks three or four large cups of coffee a day and finds that the caffeine increases his mental alertness, vigilance, and wakefulness, and generally speeds up his thought processes. It produces its mentally stimulating effects by blocking adenosine receptors in the brain. Which of the following statements about adenosine is FALSE?
A) Adenosine is a naturally occurring compound in the body that influences the release of several neurotransmitters in the central nervous system.
B) Adenosine levels gradually increase the longer a person is awake, and when they reach a certain level the urge to sleep greatly intensifies.
C) Adenosine levels gradually increase the longer a person is awake, and when they reach a certain level the person feels maximum mental alertness and arousal.
D) Caffeine's adenosine-blocking ability has the effect of indirectly stimulating mild dopamine release in the brain's reward system.

Question

Quizplus · Accepted Answer

Adenosine levels gradually increase the longer a person is awake, and when they reach a certain level the person feels maximum mental alertness and arousal is a false statement. Adenosine levels increase as wakefulness continues, but it ultimately leads to increased feelings of tiredness and a desire to sleep, not heightened alertness.

Dan Drinks Three or Four Large Cups of Coffee a Day