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Daphnia


             Homeostasis is when homeothermic organisms maintain a relatively constant body temperature. Organisms do this by using receptors in the brain to detect the temperature of the blood that passes through it. When the temperature of the blood rises a message is sent to the nervous system to stimulate sweat glands in your skin. This is a cooling effect and the body temperature falls. A decrease in body temperature also will result in a decrease of sweating or an increase in activity or shivering to try and increase the body's temperature (Campbell et al, 2003).
             II. Hypothesis.
             The increase in water temperature will increase heart rate of the Daphnia and the decrease in water temperature will decrease the heart rate of the Daphnia.
             Adding epinephrine to the water will increase the heart rate of the Daphnia. .
             III. Materials and Methods.
             Using a microscope the heart rate of a Daphnia is measured. Three .
             different sets are taken, each in fifteen-second intervals, for room temperature water, zero degrees Celsius water, and forty-five degree Celsius water. Then epinephrine is added and the heart rate is taken the same way, before epinephrine, after epinephrine, and with epinephrine. All of the results for each different time are then averaged together. For a complete description of the materials and methods used see the General Biology Study Guide (Erdahl et al, 2004).
             IV. Results.
             HEART RATE VS TEMPERATURE EXPERIMENT.
             Temperature: Trial 1 Trial 2 Trial 3 Average.
             0 28 28 28 28.
             22 25 34 33 31.
             45 40 37 41 39.
             The heart rate for the Daphnia at zero degrees Celsius was twenty-eight beats per fifteen seconds. At twenty-two degrees Celsius the heart rate was thirty-one beats per fifteen seconds. At forty-five degrees Celsius the heart rate was thirty-nine beats per fifteen seconds.
             EFFECT OF EPINEPHRINE ON HEART RATE.
             Trial 1 Trial 2 Trial 3 Average.
             Before Epinephrine 33 34 32 33.
             With Epinephrine 58 50 58 55.


Essays Related to Daphnia

1. Daphnia

... Before Epinephrine 33 34 32 33 With Epinephrine 58 50 58 55 After Epinephrine 48 49 50 49 Before epinephrine was added the heart rate of the Daphnia was thirty-three beats per fifteen seconds. With epinephrine the heart rate was fifty-five beats per fifteen seconds. After epinephrine the heart rate was ... or staying active to keep their heart rate up and their body temperature up. By doing that their heart rate would not have slowed like the Daphnia's heart rate (Campbell et al, 2003). If warm water was added and the organism was homeothermic their heart rate would however rise. When ....

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2. Chemical Stimuli and the Heart Rate of Daphnia

... rate four different times for fifteen-second intervals. After these trials were complete, we then repeated it. However, this time, we put the Daphnia in "unknown 1"." After engulfing the Daphnia in the solution, we again ran the trial, recording its heartbeat once more. After this portion of the trial was finished, we again ... trial four, a heart rate of 40. This "normal " heart rate averaged about 33 beats per fifteen-second interval. After this phase was over, we gave the Daphnia "unknown 1"". We again ran four trials for it, which resulted in the numbers 26, 26, 31, and 26. This avera...

  • Word Count: 594
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3. Biology Lab

Materials and Methods A single Daphnia is placed on a microscope slide with a depression well and covered with one or two drops of water. The Daphnia is then covered with a cover slip and placed under the microscope. Look through the microscope and count the number of heartbeats in one minute using a stopwatch. Record this data on a chart. Then, using the same daphnia, extract the water from the well where the Daphnia is and replace it with one to two drops of 5 % alcohol. Place the daphnia under the microscope and count the number of heartbeats in one minute using the same procedure. Record t...

  • Word Count: 229
  • Approx Pages: 1
  • Grade Level: High School

4. Does Caffeine affect Heart Rate?

Aim The aim of the activity was to investigate the effect of caffeine on the heart rate of Daphnia. Hypothesis Caffeine is a stimulant drug, which causes increased amounts of stimulatory neurotransmitters to be released. At high levels of consumption caffeine has been linked to restlessness, insomnia and anxiety, causing ... raised stress and blood pressure. This can lead to heart and circulatory problems. The daphnia's heart will beat faster when it receives a dose of caffeine. Caffeine belongs to a class of compounds called methylxanthines and can block a receptor on the surface of heart mu...

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5. Pond Water

... between 5-500 microns. They can be found attached to plants. They usually form brown crusts on the surfaces of under water objects such as stones and plant stems. • The Daphnia, which are multi-cellular organisms that measure between .5 and 4 mm. They are Planktonic so they can be found around plants and organic matter. The ... Daphnia are also known as water fleas. • The Rotifers, which are multi-cellular organisms and one of the most diverse groups of living organisms. The Rotifers measures are drastically different ... ...

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6. True Percula Clownfish

... , while in captivity. Using flake-type commercial fish food containing vegetable ingredients can greatly balance their diets. This diet should also be supplemented with live foods such as brine shrimp, Daphnia, mosquito larvae and Tubifex worms whenever possible. Several small feeding per day are better than a single one. They don't seem like too much of picky eaters to me! Now, The ... ...

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7. Clownfish

... , while in captivity. Using flake-type commercial fish food containing vegetable ingredients can greatly balance their diets. This diet should also be supplemented with live foods such as brine shrimp, Daphnia, mosquito larvae and Tubifex worms whenever possible. Several small feeding per day are better than a single one. They don't seem like too much of picky eaters to me! Now, The ... ...

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8. How to Keep the Elephant-Nose Fish

... much of Zaire, Cameroon and Senegal. It requires slightly acidic water of about 6.7, and a temperature ranging from 22-29'C. Elephant-noses require a well-balanced diet of livefoods such as bloodworms, daphnia, brine shrimp and mosquito larvae. They occaisionally take dried food, and will accept freeze-dried and frozen foods. It is important to ensure sufficient food reaches the bottom for the ... ...

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