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DOES CAFFEINE AFFECT HEART RATE? AIM: We intend to investigate the effect of caffeine on the heart rate of Daphnia (water fleas). BACKGROUND INFORMATION: Daphnia's is the name of a group of small, aquatic crustaceans commonly called "Water Flea" Because their exoskeletons are clear; it is possible to watch Daphnia hearts without cutting the open. This allows the changes in Daphnia heart rate to be studied easily. The normal habitat of a Daphnia is lakes, rivers and ponds they are also used as fast food for fish. They are used as a fast food for fish because they swim fast and they make the fish fight for their food and not to just to rely on the food just coming to them. A usual life span of a Daphnia is two or three days. Daphnia's are usually females and only a few males are produced the reason for this is they are...

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