Does Caffeine Have An Affect On The Heart Rate Of A Dafnia ( Water Flea )?

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Does CAFFEINE have an affect on the Heart Rate of a DAFNIA (water flea)?


The objective of this investigation was to observe the affect of caffeine on the heart rate of a Daphnia (water flea), by observing the specimen under a microscope for a set period of time while in an environment of concentrated caffeine. By using a microscope, the collection of data regarding the heart rate of the how to make a line graph in word Daphnia was possible. Drinks such as coffee, Red bull, MONSTER and Coca-Cola contain high amounts of caffeine, causing the consumer to increase their amounts of stimulatory neurotransmitters (this is a chemical in the brain sent throughout the body telling your heart to beat, your lungs to breathe, and your stomach to digest). As caffeine is a stimulant, it is predicted that the drug will increase the Heart Rate of the Daphnia. Caffeine will be used in this experiment with concentrates of black coffee.

Due to the miniature size of a Daphnia, biologists have had unique troubles with analysing the way the systems of the Daphnia function. Biologists have argued, that the circulatory system of a Daphnia relies on diffusion or convection. However, it has been decided that depending on the oxygen levels in the environment will affect the way that the circulatory system of the Daphnia functions. The levels of haemoglobin will also affect the functioning of the circulatory system in the water flea. Haemoglobin is a red blood cell, assisting the
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