The Effects of Caffeine on the Heart Rate of water flea         This lab was designed to show how caffeine affected the flavor come in of daphnia after exposing them to different intentnesss of caffeine for decennary minutes. Caffeine is a stimulant, which, in humans, causes philia judge and phone line pressure to increase. Its effects range from mild alertness to heigh 10ed anxiety and body tension. We necessityed to see if caffeine affected the daphnias middle arrange in the same way.
        We fill up three containers with three different concentrations of caffeine. The first container was our control with no caffeine, the second was filled with a .5% concentration of caffeine, and the third was filled with a 1% concentration of caffeine. Five daphnia were then placed in each container for ten minutes. After the daphnia were exposed to the concentrations for ten minutes, we used micropipettes to remove them from the solution and place them under a compound microscope. While they were under the microscope, we counted their heartbeats for twenty seconds then multiply the number by three. Each stem of daphnias heart rates was totald to get a more accurate heart rate for each concentration.
        Our hypothesis was that caffeine would increase the heart rate of the daphnia that were exposed to it.
As seen on my graph, the control sort out of daphnia that was not exposed to any levels of caffeine had an average heart rate of 195.9 beats per minute, the group that was exposed to the .5% concentration of caffeine had an average heart rate of 185.5 beats per minute, and the group that was exposed to the 1% concentration of caffeine had an average heart rate of 217.5 beats per minute. As expected, the daphnia that were exposed to the 1% concentration of caffeine had a significant increase in...
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