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Introduction
This investigation looks into how adrenaline affects the heart rate. Because it is not easy to conduct experiments into the effect of these substances on humans, they will instead be conducted using a daphnia to find out what effect the substance will have on the heart. Although humans and daphnia are very different organisms, the effect that adrenaline have on the heart should be similar. The daphnia is a good species to use because the heart can be seen under the microscope. In this way the effect of adrenaline is clearer than if the experiment was done on a human. ... An increase in cellular respiration triggers homeostatic mechanisms that increase both heart rate and breathing, resulting in more oxygen being available in cells.
We already know that chemicals affect the nervous system; in this experiment it’s going to be found out how adrenaline affects the nerves and therefore the heart rate.
The drug adrenaline, in the human body comes from the adrenal glands which are two small structures situated one atop of each kidney. ... Instead of releasing their neurotransmitters at a gap between two nerves where messages travel across (a synapse), these neurons release them into the blood. ... The adrenal medulla can also release noradrenaline, which like adrenaline is derived from the amino acid tyrosine.
Hypothesis
As the concentration of adrenaline solution in which daphnia are immersed increases, their heart rate will also increase, due to the hormone affecting the specimens’ nervous system.
Plan
This is an investigation into the effect of a range of concentrations of adrenaline (a stimulant) on the heart rate of a daphnia, a ‘water flea’ (crustacean). The heart of the daphnia will be studied under the microscope, being seen through the body tissue of the daphnia.
Prediction
It is predicted that as the concentration of the stimulant adrenaline increase, the heart rate of the daphnia will do so too.
Approximate Word count = 1489
Approximate Pages = 6
(250 words per page double spaced)
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