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AN INVESTIGATION TO SEE THE EFFECT THAT CAFFEINE HAS ON THE HEART BEAT RATE
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Submitted by johnrazzak on May 12, 2008
Category: Science
Words: 3363 | Pages: 14
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An Investigation To See The Effect That Alcohol Has Upon The Heart Rate Of Daphnia.
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Aim:
In this investigation I am going to see how alcohol affects the heart. Due to the ethical and safety issues involved in using in an investigation such as this I am going to use Daphnia (water flea) to conduct this experiment. Although humans and Daphnia are very different organisms, the affect that alcohol has upon the heart should be similar.
Hypothesis:
The hypothesis I am going to test during the investigation is:
‘Increasing the percentage of concentration of alcohol (a depressant) solution, into which a Daphnia is immersed, will significantly cause its heart rate to decrease.’
Background Knowledge:
One of the most common crustaceans to be found in lakes, ponds and quiet streams is the 'water flea', Daphnia. These tiny animals are usually less than 3mm in size, so you could put dozens of them on a single fingernail. They're not really fleas – in fact they're not insects at all, but rather crustaceans, more closely related to crabs and shrimp. Water fleas are extremely important in the food chains of ponds and lakes - they harvest the tiny algae cells that convert sun energy into food, and then they pass this energy along to other animals such as fish or other predators.
Below is a diagram that shows the anatomy of the daphnia and where everything is in its body:
[1] - Second antenna, used for swimming and sensing the environment.
[2] - Eye controlled by muscles with nerve connections to the brain.
[3] - Legs used for collecting food and stabilizing the animal as it slowly sinks.
[4] - An intestine where ground up food particles are digested.
[5] - A brood pouch for incubating young that hatch from large yolk filled eggs.
[6] - A protective outer shell.
[7] - A heart that pushes clear circulatory fluid around the body.
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