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the effect of caffiene on the heartrate of daphnia
Member rating: No Rating | Words: | Submitted: Thu Feb 22 2007
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Hypothesis Caffeine acts as a stimulant. When taken it gradually increases the heart rate causing the heart to beat faster depending on the amount of caffeine accepted. Caffeine belongs to a group of compounds called methylxanthines that block a receptor on the surface of heart muscle cells for adenosine. It is caffeine's obstruction of the adenosine receptor in the heart that causes the heart to beat faster after a certain dosage of caffeine. I therefore predict the more caffeine added to the surrounding water to where the flea is allocated, the higher the flea's heart rate will be. Predicted graph of the effect of caffeine on the heart rate of daphnia Heartbeats of Daphnia (Beats/sec) Daphnia in caffeine concentration (%) Apparatus In my investigation I will be using the following equipment: Microscope to see the daphnia's heartbeat as it is a very small organism and is impossible to see the heart of the daphnia without a microscope Lamp...
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