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The Effect of Caffeine on the Heart Rate of Daphnia Introduction Caffeine is widely known as a stimulant. Stimulants cause an increase in the metabolism of the human body resulting in an increase in the rate of the heart and lungs. In small doses they wake you up and give you a high by exciting the central nervous system. In high doses they can make you anxious, irritable and even psychotic. Caffeine perks you up by stimulating the heart and suppressing the effect of adenosine, one of the brains inhibitory chemicals. Caffeine also increases blood pressure and promotes urine formation. I will only be investigating the effect of caffeine on the heart rate. Daphnia are typically freshwater creatures but are capable of surviving in slightly salty water. There is a big difference in the size of a Daphniidae, depending on the species. Newly hatched Moina are slightly larger than newly hatched brine shrimps...

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