Aim: To see the effect of caffeine on the heart rate of the water flea Daphnia.…
5. Establish the resting heart rate of the Daphnia. Count the amount of beats for ten seconds then multiply that number by six to convert it to beats/min.…
Ectothermic animals are animals whose body temperature is affected by their surroundings. This means that if the environment is cold the animal will be cold. If the environment is warm the animal will be warm. This is because the animal doesn’t have the capability of regulating its body systems to keep a constant body temperature. When an ectothermic animal is cold, its heart rate will lower. When the animal is warmer, the heart rate will raise – as long as the temperature isn’t sufficiently high to harm the animal. (Campbell, 2005) Daphnia magna is a semi-transparent organism. Also it is a type of water fleas, are used to study the effects of caffeine on heart rate. It will be easy to discover and count the heart rate of Daphnia as long as the Microscope is set up correctly. The goal of this project is to measure the heart rate of Daphnia whether it will increase or decrease after a caffeine is added. Basically this lab report will explain the experiments on Daphnia and observe the effect of different beverages in different amounts on the Daphnia 's heartbeat. Daphnia is an animal who lives in water and referred to as the water flea. Daphnia is a sensitive species in freshwater and many times is used as a model in biological studies.…
Larynx- Voice box. The epiglottis helps to prevent food from entering the larynx during swallowing. Short passageway.…
Caffeine is a bitter, white crystalline xanthine alkaloid and a stimulant drug. Caffeine is found in varying quantities in the seeds, leaves, and fruit of some plants, where it acts as a natural pesticide that paralyzes and kills certain insects feeding on the plants, as well as enhancing the reward memory of pollinators.…
The purpose of lab number thirteen was to examine the response of the daphnia to a chemical stimulant. Also examined was how human resting heart rates differed from the daphnia’s. Stimulants are any substances that raise the levels of activity in the body. Stimulants could be a number of things such as physical or chemical. Physical stimulus usually deal with something that affects the five senses such as sight, hearing these could be attributed to loud noises or too much light going into your eye. Chemical stimuli differ because chemicals such as caffeine and alcohol usually cause these to affect cognitive abilities and heart rate. These same things can also affect muscle response and glandular response causing twitches and the production…
I think that the data collected is fairly reliable. It could be questioned as the experiment was only repeated once and it was done fairly hastily.…
According to our experiment, only caffeine and aspirin increased the heart rate of Daphnia; whereas the rest of the drugs decreased its heart rate. Initially, we expected that aspirin would not have any effect but it had an increasing effect, which was a bit surprising. During the experiment, we encountered some counting errors that we had to repeat the procedure and do the calculations again. For example, when we tested our control--spring water, we had a suspicious result; thus, we asked other groups to make sure if our trial results were close to theirs. Furthermore, it was important to switch the microscope light off and wait at least 30 seconds before starting the next trial because the microscope lights heat up the Daphnia and increase their heart rates if left on for long. This could potentially harm and result in death of Daphnia, which suggest that we should be ethical while doing the experiment. Lastly, we also observed that different daphnia gave different…
I think for both of the graphs show that the treatment with the algae and daphnia was something to definitely look at. There was a significant difference between the initial and final that is very high in scientific interest. But I believe it is also of scientific interest that the flask with just algae showed that there wasn’t much change in the total phosphorus but there was a significant change in the phosphate. The changes occurred because the daphnia ate the algae leaving less nutrients in the water which phosphorus is…
The left ventricle has a much thicker wall than the right ventricle because the left ventricle has to pump blood to the whole body while the right ventricle only has to pump blood to the lungs.…
For this experiment we tested the effects of different adrenalin concentrations (0.001%; 0.01%; 0.1%) on the daphnia flea. The daphnia was placed on a slide with cover slip in order to examine its heartbeat by using the microscope.…
To obtain the control of this experiment we prepared a slide with a single drop of water and a single Daphnia. We then counted the Daphnia 's heart rate for one minute.…
• Provide a few sentences of background information on the effects of these two drugs on heart rate in Daphnia or other animals (including humans). Cite the source(s) of your information, such as (Castle and Paulson 2010) for your laboratory manual. Also include the appropriate sources from your internet search. (See “Literature Cited” below.)…
The projects purpose was to determine the effects of alcohol and caffeine on the heartbeat rate in Daphnia Magnus. Our hypothesis is alcohol causes a decrease in heart rate, whereas caffeine causes an accelerated heart rate, predicting that the more caffeine we give the daphnia the faster it heartbeat rate will become and the heartbeat rate will decrease as we give the Daphnia alcohol. After doing the experiment we found that the more caffeine we added to the Daphnia Magna the faster its heartbeat rate became. We also found that when we added alcohol to the Daphnia the heartbeat rate also increased not supporting our hypothesis.…
The purpose of this laboratory exercise was to demonstrate and explain the effects caffeine on the circulatory system of blackworms and to test the hypothesis that high concentrated caffeine will double the heart rate pulsation of blackworms. Blackworms have several complex systems including a closed circulatory system: a complete digestive tract: and a nervous system, including a brain and a cord. Because of the transparent skin of the blackworm, its large dorsal blood vessel is very easy to see through the microscope. Since the rate of pulsation is easily seen and calculated it’s easy to test the effects of different chemicals on their cardiovascular system. Since it’s known that caffeine increases the blood pressure one might expect that the blackworms under the influence of caffeine will show a grater average of pulsation rate.…