Increase the Heartbeat of the Daphnia
Increase the Heartbeat of the Daphnia
Hypothesis:
What affects the heart rate of Daphnia magna? We believe that if we give coffee to the water flea, then its heartbeat will increase because of the caffeine. Research has shown that caffeine is a stimulant which will increase heart rate. Caffeine has this affects on humans and so, it should have a similar effect on the water flea.
Experimental Procedure:
Step 1: Put one Daphnia on one slide.
Step 2: Monitor the heartbeat of the daphnia for one minute.
Step 3: Record the data.
Step 4: Add one drop of caffeine to the same slide. Let the Daphnia sit for at least ten seconds and then monitor the heartbeat for one minute.
Step 5: Record the data.
Step 6: Repeat the steps 1-5 two more times but with a new daphnia and a clean slide.
Step 7: Clean up the lab.
Data and Observations:
As the we went through the experiment, we recorded that the Daphnias average heartbeat while in the water was 134 beats per minute. The Daphnias average heartbeat with the added caffeine was 126 beats per minute.
Heartbeat of the Daphnia
Trial 1
Trial 2
Trial 3
Average
Water
120 beats per minute
162 beats per minute
120 beats per minute
134 beats per minute
Coffee (1 Drop)
108 beats per minute
144 beats per minute
126 beats per minute