Multiple choice general knowledge science & technology

What sleep-inducing chemical does caffeine block from binding to nerve cells?

  1. dopamine

  2. oxytosin

  3. adenosine

  4. dummy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Caffeine works by blocking adenosine, a sleep-inducing chemical, from binding to nerve receptors in the brain. Adenosine normally accumulates during the day and makes us feel tired. By blocking adenosine receptors, caffeine prevents this fatigue signal and promotes wakefulness. Dopamine and oxytocin are not blocked by caffeine.

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