989K views · 11K reactions | How does coffee work? What even IS caffeine? 樂☕️ Caffeine works primarily by blocking adenosine, a neurotransmitter that makes you feel tired and sleepy. By preventing adenosine from binding to its receptors in the brain, caffeine promotes alertness and energy. This stimulant also triggers the release of adrenaline and dopamine, increasing heart rate, breathing, and feelings of well-being! #science #science #coffee | Learning with Lyrics | Facebook