This data did not completely support the hypothesis because there was no provision for the possibility of death in the hypothesis. This can be explained several ways. Get custom essay sample written according to your requirements Urgent 3h delivery guaranteed Order Now. Any excess petroleum jelly was wiped off so that there was only one layer on the well. Sorry, but copying text is forbidden on this website. The effect of one outside substance can impair the effects of other substances.
Any excess petroleum jelly was wiped off so that there was only one layer on the well. It will work by causing the nervous system to work faster. Then the same procedure using the Petri dish to changed environmental conditions was used with cold tap water 23 degrees , warm tap water 30 degrees , and hot tap water 45 degrees. It can be assumed that this trend would continue until the Daphnia died. Under normal circumstances, the heart rate will increase as more caffeine is added. Table 3 showed the effects of caffeine on Daphnia.
First a zero reading was taken before any chemicals were introduced.
The hypothesis is that lowering the temperature of the surroundings of the ectothermic Daphnia magna will cause its heart rate to lower, and raising the temperature will increase heart rate.
The cold water Petri dish was placed on the stage of the microscope, and the Daphnia was placed on top of the dish. In conclusion the data collected supports that an increase in the caffeine concentration leads to an increase in the heart rate of the daphnia. As higher concentrations of caffeine solution were introduced, there was no effect on this Daphnia. It will be directly proportional to each other, meaning that the increase of the concentration of the caffeine will give an increase of the heartbeat.
These things have an obvious practical application in the medical field.
Daphnia Heart Rate – Lab Report
LaFave, After an intoxicating exposure to alcohol, an organisms system will be impaired for an extended period of time. The team then used the same procedure used with alcohol to introduce caffeine solution of the same concentrations.
The teams each obtained a depression slide and smeared a small amount of petroleum jelly on one of the wells. It showed that a standard temperature is most preferred by an ectothermic creature. The concentration of the caffeine in the blood of Daphnia will determine the heart rate of the Daphnia.
Leave your email and we will send you an example after 24 hours Click to learn more https: LaFave, When the caffeine was introduced to the system, there was no change. Now fill the petri dish with a caffeine solution. The ectothermic qualities of Daphnia explained the effects of temperature on the animal.
Accessed May 23, A heart rate reading was taken for each temperature. There also rtae have been errors daphnis the way Daphnia was handled. Get custom essay sample written according to your requirements Urgent 3h delivery guaranteed Order Now. Both teams obtained a plastic pipette and cut off the tip at the first graduation from the bottom to allow Daphnia magna to fit into the pipette.
How to cite this page Choose cite format: It is used as a stimulant to human the central nervous system by increasing the stimulatory of the neurotransmitters, however high levels of caffeine to the body can cause effects of insomnia, stress, anxiety, weight loos or high blood pressure.
The ectothermic nature and transparency of Daphnia magna made it very easy to observe the effects of environmental changes. It can be assumed that this trend would continue until the Daphnia died. The alcohol acts by inhibiting the nervous system. After a minute a heart rate reading was taken.
Lab Report Daphnia | Free Essays –
The other team worked on the effects of Alcohol and Daphhnia on the heart rate. We’ll occasionally send you account related and promo emails.
Table 2 Table 3: Also, it will cause the blood vessels to constrict. This could show that the solution Daphnia was weak at the onset of the experiment.
When repeating a test a different Daphnia is used. At some point Daphnia would freeze and die, but barring that point the heart eseay would get lower and lower with colder temperatures.
A Kimwipe was used to draw off excess fluid from the slide. Death occurred at 45 degrees.