This experiment was conducted to study the effects of household drugs on the circulatory functions of the blackworm, Lumbriculus variegatus. The first hypothesis for this experiment is as the concentration of caffeine increases, there will be an increase in the pulsation rate. The null hypothesis is that as the concentration of caffeine increase, there will not be an increase in the pulsation rate. Based on the results, there was a statistical significance with a >95% confidence level in the difference of water and caffeine 10mM. Therefore, the experimental hypothesis is supported by the data and is accepted. The second hypothesis being tested is that as the concentration of nicotine increases, there will be an increase in the pulsation rate.
