Lab Report Daphnia

Homeostasis is the maintenance of the internal environment despite changes in the external environment. One of these environmental conditions is temperature. Fish are ectotherms, or conformers, which means they can not maintain a constant body temperature. They change their body temperature, by moving from colder to

effected the heartbeat rate of a Daphnia. The results of the experiment were that the

The purpose of this experiment was to determine the relationship between tail spine length and hemoglobin levels as well as the relationship between tail spine length and heart rate. The concentration of the hemoglobin in Daphnia is dependent on the oxygen available to them.

Freeman (2008) furthers Eckert et al’s argument by stating that the actin filaments of the muscle cell in organisms are able to intake ATP (adenosine triphosphate) faster and will move the organism faster when higher temperatures are imposed. This is because of an increase in enzyme reaction rates (Freeman 2008). These arguments can be applied to our experiment to help explain the trends observed. It can be argued that as the Gammarus setosus experiences the cold treatments, the organ of Bellonci senses the cold temperature, which in turn signals the organism to preserve its energy to protect itself; therefore, the organism will swim slower. In addition, the enzymes in the muscle cells of the organism, when experiencing the cold treatments, will have decreased ability to carry out enzymatic reactions, therefore inhibiting the uptake of ATP, which will cause the organism to swim slowly. Conversely, as the organisms are put into the heated treatments, the organ of Bellonci senses the heat, and allows the organism to swim faster, since it does not have allocate as much of its energy towards survival. Furthermore, the enzymes in the cells will be able to catalyze reactions more quickly, therefore allowing the organism to swim faster. However, when the temperature of the surroundings is too high, the enzymes will denature, therefore, reducing the activity rate of

Week three the daphnia are tested under different concentrations of an herb to see if the herb causes any types of stress on the variable. All of the same methods are done as in week one and two except in preparing the herbal solutions. To prepare the herbal solution the herb needs to be grinded mixed with methanol and left to sit for a few minutes so it can react and separate the important contents of the herb out. In large clear wells the mixture is measured in microliters of 500, 50 and 5, we also measure out 500 of methanol and all of these are left to dry out. Then 5ml of water is added to 5 wells the four

The Daphnia and the cavity in the slide was surrounded by a ring of cotton wool, this restricted the movement of the Daphnia making it easier to count its heart rate under the microscope.

Background: Daphnia is also known as diploid or water fleas belong to a group of animals named crustaceans. They are too small to be seen with the naked eye. There are two chromosomes are from the father and mother also, they are multicellular. They live in freshwater and in a few terrestrial habitats. (Textbook 595 & 680)

The purpose of this lab is to analysis goldfish an ectothermic animal affect toward different temperature ranges. The reactions toward the temperatures are taken upon the term of homeostasis, which is regulation for organisms to maintain a steady state while adapting to the conditions that are favorable for survival (Encyclopedia Britannica). In order to achieve a successful homeostasis, many animals use different methods of thermoregulation, which helps maintain the internal temperature of animals. Many methods vary whether the organisms is an endotherm or ectoderm. An endotherm, which includes mammals and birds, is a warm-blooded animal, which maintains a constant body temperature not influenced by the environment (Britannica).

Somewhat more precise descriptions can be made by using the terms poikilothermic and homoiothermic. The body temperature of poikllotherms is relatively variable, while that of homeotherms is relatively constant.

This experiment was done to test whether or not the drugs Nicotine, Alcohol, Pain Killers, Nyquil, and Caffeine were stimulants (increase in the body’s metabolism and consequently increase the heart rate) or depressants (slow the rate of metabolism and consequently slow the heart rate) of the homeostasis (the ability of one’s body to maintain a constant internal environment) of Daphnia.

One of the most noticeable forms of homeostasis in Betta splendens is temperature regulation. This is because alterations in water temperature change the metabolic and biochemical functions in fish. (Ostrander, 2000) Enzymes within cells require an optimal temperature for them to function efficiently. The internal temperature of an animal is constantly being reported by sensors in blood vessels to the hypothalamus. After the temperature has been analysed by the hypothalamus, appropriate changes are made, often in the form of behavioural adjustments. The Betta splendens is a poikilothermic animal, an animal whose temperature is dependent on the temperature of their external environment.

There are many patterns that can be observed throughout our environment. In this experiment, the temperatures of organisms in a biophysical environment were analyzed to see if a pattern could be recognized that was related to the behavior of an ectotherm. An ectotherm is an organism that relies on the environment to regulate its body temperature. Organisms such as Pseudemys (turtles) and Lacertilia (lizards) are examples or ectotherms. After arriving at Maxcy Gregg Park and analyzing the temperatures of four microhabitats within two habitats with infrared thermometers, the temperatures were compared between the microhabitats. Then, one habitat was chosen to analyze the temperatures between

Ectotherms utilize behavioral adaptations to their environment in order to allow heat exchange to take place in a manner better suited for thermoregulation. Serving as model ectotherms, the sugar-covered marshmallows in the shape of the bird, peeps, were subject to two different microhabitats including a sandy and plastic microhabitat to see the rate of temperature over time and the temperature at which a stable internal temperature was reached. It was hypothesized that the peeps would experience more thermal stress and greater/faster thermal rise on the plastic than in the opposing microhabitat: the wet sand, when thermoregulating over time. An experiment at Maxcy Greg park was set up where five peeps were placed into each microhabitat while

This experiment has a wide-range of applications from performing diagnostic tests to smart buying of commercial products such as soaps, and deodorants. Diascopy is conducted to test the blanch-ability of the skin as blanching is a vital indicator of overall health and may be used as an early test for poor blood circulation. Diascopy is done by applying pressure on the skin with a finger or glass slide and observing any color changes that take place. Knowledge on the composition of sweat also helps in choosing proper skin care products. Antiperspirants usually contain active ingredients such as aluminum salts which function as astringents by constricting the opening of the sweat gland ducts to reduce the secretion of sweat.

Hand out from the Natural Science Establishment, six dialysis tubing, six plastic cups, distilled water, 0.2 M, 0.4 M, 0.6 M, 0.8 M, and 1.0 M samples of a sucrose solution, paper towels, and a scale.