Daphnia Magna Research Paper

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Daphnia magna are planktonic crustaceans that belong to the subclass Phyllopoda. They can dwell in a great margin of standing freshwater with an exception for extreme habitats (Ebert, 2005). Some species may be found clinging to substrates like water plants or over sediments of shallow ponds (Ebert, 2005). Daphnia magna adults can range in size from smaller than 1mm to as great as 5mm. Daphnia have open blood circulation, and their heart is located dorsally which is anterior from the brood chamber (Ebert, 2005). At 20ºC, the heart beats around 200 times per minute, and slows down at lower temperatures (Ebert, 2005). Daphnia magna was selected as the subject of this lab experiment due to their frequent use in bioassay studies in testing the impact substances may have on human beings because of their similarities. Daphnia magna have myogenic heart tissue which is very similar to the heart tissue found in mammal creatures (Campbell, Wann, & Matthews, 2004). Because …show more content…
Caffeine in an alkaloid which causes an increase of stimulatory neurotransmitters to be released (Walton, Kalmar , & Cafarelli, 2002). Neurotransmitters are neurochemical messengers that take responsibility in communicating information throughout the brain and body. Both green tea and black tea contain some amount of caffeine in them, but green tea contains a significantly less amount than does the black tea. Tea is one of the most consumed beverages in the world, and is prepared from the leaves of the shrub, Camellia sinensis (Fernández-Cáceres, Martín, Pablos, & González, 2001). In respects to this, it is expected to observe an increase of heart rate in the Daphnia magna once it is submerged in the black tea extract containing much higher doses of caffeine and to observe a decrease in heart rate with the green tea extract
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