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The Ultimate Caffeine Quiz
by Staff
It wakes you up, gets you going, and may even cure your headache. But how much do you really know about caffeine?

What percentage of Americans consume caffeine every day?

  • 50 percent
  • 75 percent
  • 90 percent

What is caffeine's medical name?

  • trimethylxanthine
  • tryptamine
  • glucose

How many milligrams of caffeine does the average 6-ounce cup of coffee contain?

  • 400
  • 100
  • 250

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

  • dopamine
  • oxytosin
  • adenosine

Which neurotransmitter, or chemical messenger, does caffeine stimulate?

  • dopamine
  • epinephrine
  • serotonin

How long does it take your body to rid itself of just half the caffeine you consume?

  • one hour
  • six hours
  • 12 hours

Which is not an effect of caffeine?

  • sweaty palms
  • dilated pupils
  • decreased blood flow to the stomach

How might caffeine help cure a headache?

  • increase heart rate
  • constrict blood vessels
  • increase energy

Which of these is a symptom of caffeine withdrawal?

  • headache
  • nausea
  • shortness of breath

Which illegal drug has a similar effect as caffeine on your body?

  • marijuana
  • barbiturates
  • cocaine