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Crayfish Lab Report

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Crayfish have traditionally served as model organisms for studying the physiology and development of decapod crustaceans as well as a wide variety of other animals (Vogt 2008). The relatively easy access to the heart as well as the ability of the organism to remain alive for about 30 minutes after being dissected makes it a viable candidate for studying the circulatory system in a living organism. Decapods, such as crayfish, have an open circulatory system, which differs from vertebrate closed systems in the method of dispersing the nutrient-carrying fluid. The hemolymph in open systems is pumped directly into the body cavity, whereas the blood in closed systems is circulated within vessels and the blood never leaves the confinement of the …show more content…
By using temperature and various neurotransmitters consecutively, we can study how these factors counteract or enhance the others’ effects on heart rate and beat amplitude. While the decapod circulatory system and cardiac control differ from those of humans, the results of this experiment have potential implications in medicine. For instance, GABA may be used to slow down heart rate in a patient who is suffering from tachycardia (abnormally fast heart rate). We predict that subjecting the heart to cold temperatures will decrease the heart rate and the amplitude of the heart beats when compared to the rate and amplitude at room temperature. We predict that serotonin will counteract these effects and increase both the heart rate and the amplitude of the heart beats after being subjected to cold temperatures. We predict that GABA will then decrease the increased heart rate and amplitude that resulted from the application of serotonin. Furthermore, we expect the effects of neurotransmitter on heart rate and beat amplitude to be stronger as neurotransmitter concentration is

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