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How Caffeine Affects the Body. Caffeine stimulates heart rate through a well documented process in the cardiac cells. Caffeine blocks the enzyme phosphodiesterace, which normally actviates production of an enzyme, cyclic AMP (cAMP), which initates a protein that increases heart rate.s for heart rate, caffeine is a central nervous system stimulant. It is in a class with other psychoactive drugs like epinephrine, amphetamines, cocaine, Ecstacy, nicotine and other ADHD medications like Ritalin. It is one of the few psychoactives that is legal.
Caffeine is a stimulant that can speed up the body. If overdosed on caffeine it can cause serious health problems such as: various kinds of cancer, birth defect, heart and digestive problems. Caffeine is found in many popular foods such as: coffee, cocoa, tea, and chocolate.he original purpose of this experiment was to determine how caffeine affected the heart rate of daphnia (Water Flea). The results of the experiment were that in the first trial the more caffeine put into the water the higher the heart rate.