caffeine molecules in the blood flow - section view 3d

caffeine guaranine methyltheobromine theobromine paraxanthine central nervous system cns stimulant methylxanthine class cyclic amp blocking binding psychoactive drug adenosine neurotransmitter acetylcholine ach nootropics cognitive enhancer purine alkaloid adenine guanine coffee bean steeping coffee black tea cola bronchopulmonary dysplasia apnea prematurity caffeine citrate parkinson's disease sleep disruption blood pressure heart rate increased urine output cup wake nigh shift espresso cappuccino macchiato latte ristretto green cacao ergogenic aid fat oxidation l-theanine deprivation