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How does caffeine affect heart rate? Introduction This experiment is to investigate the affect of caffeine on the heart rate. Daphnia The Daphnia also sometimes called a water flea is a genus of Crustaceans that is found abundantly in small bodies of fresh water. Some of these are just large enough to be seen without a microscope in good light. Daphnia belongs to Kingdom Animalia, Phylum Arthropoda, Order Cladocera, Family Daphnidae, Genus Daphnia, and Species Daphnia pulex. It is usually found in fresh water, although there are some that live in salty water. It is an important link in the aquatic food chain. Daphnia has a small and semi-transparent body, which help one to study the effects of various drugs on the heart. It is a type of small crustacean and is generally 0.2 to 3.0 mm long. Apparatus We need * Culture of daphnia * Cavity slides * Standard glass ware (beaker) * Dropping pipettes...

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