The Effect of Raising and Lowering Temperature and .
Epinephrine on the Heart Rate of Daphnia.
The Daphnia is a crustacean, also knows as the water flea', widespread in lakes and ponds. The average size of a single Daphnia is three millimeters. They are directly linked to other crustaceans like crabs, shrimps, and lobsters (BioMedia, 2003). .
Even though this animal is minuscule they are needed for the survival of other aquatic life. Daphnia produce little algae cells that change sun energy into food. When other animals, like trout, consume them this energy is passed on (BioMedia, 2003).
Daphnia are also ectothermic, or cold-blooded. They do not draw heat from their own metabolism, which is called homeothermic. Instead they must get it from an outside source. They regulate their body temperature by soaking up heat from the environment around it (Campbell et al, 2003).
In this experiment there are many reasons why the Daphnia is used. One reason is that they are very responsive to the variations in water. Daphnia are also very cheap to raise outside of their natural environment. Another reason that Daphnia make a great organism for the testing is that they grow and mature in a matter of days, therefore a culture is easy to grow. The Daphnia is also transparent. This is very helpful because when looking at them through a microscope you can see the heart, legs, and antenna moving, so you do not have to kill the animal for observation (Authentic Inquiry, 2003).
In humans, homeothermic animals, epinephrine, also known as adrenaline, is produced in the adrenal glands. In stressful situations, it is released from these glands, which causes a rise in heart rate, in turn allowing more blood to pump through the body. It also causes an increase in blood pressure because it contracts blood vessels. Breathing is also easier because epinephrine decreases airway resistance. Another effect on the body is that it raises blood glucose to supply needed energy (Campbell et al, 2003).
The average size of a single Daphnia is three millimeters. ... Daphnia produce little algae cells that change sun energy into food. ... Daphnia are also ectothermic, or cold-blooded. ... In this experiment there are many reasons why the Daphnia is used. ... The Daphnia is also transparent. ...
In this case, the organism we were examining was a Daphnia. ... This time, we gave the Daphnia "unknown 2"". ... After phase two, we gave the Daphnia "unknown 2"." ... The normal heart rate for the Daphnia was about 33. ... In the last phase, we gave the Daphnia nothing. ...
The Daphnia is then covered with a cover slip and placed under the microscope. ... 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. ... Dispose of the Daphnia. Next, get a new Daphnia and do the same procedure with the Daphnia in water. ... Use a new Daphnia for each potency of the chemical. ...
Aim The aim of the activity was to investigate the effect of caffeine on the heart rate of Daphnia. ... The daphnia's heart will beat faster when it receives a dose of caffeine. ... The concentrations were diluted in a separate small beaker and then one drop of the solution was dropped onto the daphnia. ...
How to keep the elephant-nose fish The Elephant-nosed fish, or Ubangi Mormyrid [Gnathonemus Petersii] is probably the most commonly encountered of the elephant-noses. It belongs to the Mormyrid family, fishes related to the knifefishes of south-America. They give off minute electrical impulses to ...
An amazing world exists just beyond the naked eye. Pond water is one place to investigate this landscape of single cells that behave as independent organisms. Biologists have named this group, the protists. This report will fill you in on ones that can be most likely found in ponds. Protist, were a...
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