1. Chemical Stimuli and the Heart Rate of Daphnia
... of chemicals. In this case, the organism we were examining was a Daphnia. Two separate unknown chemicals and a control were used in the process, with the control being water. Our predictions were that one of the solutions would cause the heart rate to increase, while the other solution would cause the heart rate to decrease ... was it's natural heart rate. In trial 1, the Daphnia had a heart rate of 33, trial 2 a heart rate of 30, trial 3, a heart rate of 29, and trial four, a heart rate of 40. This "normal " heart rate averaged about 33 beats per fifteen-second interval. After this phas...
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- Grade Level: High School