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Closed Circulatory System Lab Report

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The purpose of this experiment was to identify how open and closed circulatory systems respond to chemical stimulants. During this experiment a ghost shrimp represented the open circulatory system, while the black worm represented the closed circulatory system. For each organism there resting heart rates were recorded by count the number of pulsations the organism had under a microscope. First, the shrimp and the worm were treated with caffeine, and then their heart rate was recorded after the organisms were exposed to the treatment for three minutes. The organisms were removed from the caffeine, and were given time to return back to their resting heart rates. The shrimp and the worm were then exposed to ethanol, and there hear rates were recorded again.…show more content…
When the shrimp was exposed to the caffeine the heart rate increased by 50.4 beats, and when the shrimp was exposed to the ethanol the heart rate decreased by 34.8 beats. The worms average resting heart rate was 21, the heart rate affected by caffeine was 32.83, and the heart rate affected by ethanol was 21. The average increase in heart rate was 11.83 beats, and the average decrease in heart rate was 7.5 beats. From this data we can conclude that caffeine acted as a chemical stimulant and speed up how frequently the heart was pumping blood into the system. Ethanol acted as a chemical sedative and slowed down how many times the heart pumped blood into the system. Even though the two organisms had different circulatory systems, they were still affected in the same manner. The only difference between the two systems during this experiment is open circulatory systems have higher heart rates overall compared to closed circulatory
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