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ABSTRACT

Daphnia: Depressants and Stimulants in Action Angel Sandoval, Mayra Vega, Kelsey Fagundes, Anthony Van Alst, & Erick Gomez El Nido Elementary School. RESULTS

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ABSTRACT

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  1. Daphnia: Depressants and Stimulants in Action Angel Sandoval, Mayra Vega, Kelsey Fagundes, Anthony Van Alst, & Erick Gomez El Nido Elementary School RESULTS Unfortunately, our data showed that stimulants slowed down the heart rate of the daphnia and depressants speed it up. Our control, which was water, showed a higher heart rate than all of the stimulants. Oddly, it was higher than the depressant. Substance A, B, and D were stimulants and Substance C was a depressant, but our results didn’t show that. ABSTRACT Our hypothesis was to show that stimulants will speed up the heart beats and depressants will slow down the heart rates. Our results did not prove our hypothesis. We used the methods to the best of our abilities, but still failed. Therefore, in our discussion we talked about the many mistakes we made have made during the experiments. • METHODS • We put on gloves. • Put a small piece of cotton on the slide. • Catch a daphnia in the eyedropper. • Put a daphnia on the slide. • Carefully put the daphnia on the slide and focus on the heart. • Place 5-6 drops of each substance on the daphnia. • Count the heart beats for 15 seconds and multiply by 4. • Record results on graph. • Repeat for each substance. DISCUSSION The complete reverse of our hypothesis occurred. The depressants showed an increase in heart rates while the stimulant showed a decrease in heart rates. Conclusively, we found that daphnia is a difficult subject to experiment on. Counting the heart beats was difficult to do because we could barely see the heart and it was troublesome to count the rapid beats. We also had difficulty in not killing the daphnia because we were putting to much of the substances and handling them roughly. Tracking the data was difficult and we would compare our results with other groups. If we were to conduct this experiment again we would need a stronger microscope, handle the daphnia more delicately, and worry about our own data. INTRODUCTION We are going to discuss the effects of both stimulants and depressants on daphnia’s hear rate. In our hypothesis, we believe that stimulants will accelerated the heart beat, while depressants will lowered their heart rates. By using our constants: cotton, eyedropper, pocket microscope, and slide we look at the metamorphosis of the heart rate caused by the stimulants and depressants.

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