The Effect of Temperature and Epinephrine on The heart rate of Daphnia Leslie Orzetti-Gollhofer Gaby Macias The Daphnia is a Crustacean other known as the water flea. It lives in small bodies of freshwater. The Daphnia is ectothermic, meaning it controls its body temperature through external means. With this experiment we experienced first hand what the effect temperature has on a Daphnia’s heart rate. We also experimented what effect epinephrine has on a Daphnia’s heart rate.
If we add hot water, then the Daphnia’s heart rate will increase. If we add cold water, the Daphnia’s heart rate will decrease. If we add epinephrine, then the heart rate will increase. A pipet was used to place the Daphnia with water on a glass slide. The slide was then placed under a glass microscope to be observed for the experiment. A tally counter was used to count the heart rates of the Daphnia when it was placed in warm water, under ice and in epinephrine.
When we experimented what the effect temperature has on the Daphnia’s heart rate, we started with an average control of 64 beats in 15 seconds. After placing the Daphnia in warm water the average heart rate went up to an average of 72 beats in 15 seconds, with an average increase of 12. 5%. When we placed the Daphnia over ice the average heart rate decreased to an average of 43 beats in 15 seconds, with an average decrease of 33%. When we experimented what the effect of epinephrine has on the Daphnia’s heart rate, we started with an average control of 73 beats in 15 seconds before adding epinephrine.
The Essay on How Caffeine Affects The Heart Rate Of Daphnia
The purpose of this experiment is to determine whether or not caffeine has an affect on the heart rate of DaphniaHypothesisThe Daphnia heart rate will increase with the concentration of caffeine. I based my hypothesis on the fact that humans heart rates increase with caffeine as it acts as a stimulant drug. In the experiment there will be several variables that I need to try and control, the ...
When the epinephrine was added to our experiment the average heart rate increased to 83 beats in 15 seconds. , with an average of 14%. After the epinephrine was diluted from the slide the average heart rate returned to an average of 78 beats in 15 seconds, with a decrease of 7% from the heart rate with epinephrine After putting the Daphnia in warm water the average heart rate increased by 12. 5%. The average heart rate then decreased by 33% in cold water. This is because they are cold-blooded animals; therefore they cannot go through thermoregulation.
