The effects of stimulants,depressants,and lactose on Daphnia

Presenter(s)

Zadira McGee

Abstract or Description

The project was to visually express the effects of stimulants,depressants and lactose on the Daphnia's Heart.The hypothesis is Daphnia's heart rate increases with the stimulant solution and decreases with the depressant solution at a linear rate.And It will have severe arrhythmias when introduced to lactose. Do five trials of the untested Daphnia. This will be used to compare to the tested data sets. Then repeat for all levels caffeine, alcohol and lactose.My two main graphs are scatter plots one showing the linear increase in heart rate with the caffeine with an R2value of 0.78 and the other showing the linear decrease in heart rate with the alcohol solution with an R2 value of 0.992. The R2value means how much it increases and decreases per change.The other four graphs are comparing the control group to  each level of caffeine solution and alcohol solution. The other two graphs show the amount of arrhythmias and muscle spasms for each lactose concentration at different intervals of time. My data shows that the higher increase in caffeine concentration increases the daphnia's heart rate at a linear rate as well as the higher the depressant concentration decreases the daphnia's heart at a linear rate.  My data from the lactose experiment concludes that not only does the lactose cause arrhythmias ,but it also causes irregular muscle spasms and the higher the concentration of the lactose the more frequent and severe these arrhythmias and muscle spasms.