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Kiaalyce1 Kiaalyce1
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6 years ago
Caffeine binds to adenosine receptors and blocks them. The end result is feeling awake because adenosine is unable to activate its receptors to promote sleepiness. Caffeine is:
 
  a. a direct antagonist.
  b. an indirect antagonist.
  c. a direct agonist.
  d. an indirect antagonist.
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tbh1227tbh1227
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