Biology Lab Essay

IntroductionThis week in Biology Lab we versed the effects of caffeine and nicotine on knocker govern. Based on preceding turn inledge of caffeine and nicotine, I came up with the following hypothesis The front end of nicotine will slow the optic rate of the worm and the presence of caffeine will speed the rate up. My hypothesis was based on what I seen in everyday life. A person who smokes a lot of cigarettes unremarkably have a slower heart rate, whereas a person whom drinks a lot of caffeine sodas are hyper and have a faster heart beat. I think the effect of caffeine and nicotine will have the same(p) effect on the species we are using in class, a fresh water blackworm.Materials & MethodsTo begin this lab we first had to build a viewing bedroom to view our worms under(a) the microscope. To make the viewing chamber we had to use somewhat 12 wax like parafilm sheets on a slideway. We made current each of the sheets fit on the slide, and stacked them up to make convinc ed(predicate) that the worm could not get taboo. We use a heating menage to melt the parafilm sheets but we had to be careful not to let the slide get to hot because it would burn. Using a razor we had to cut out a trough. This is where the worm would sit in so we could view it under the microscope. Our teacher has prepared us with 3 different molarities of caffeine and 3 different molarities of nicotine. Using a dropper we had to put about 3 drops of caffeine or nicotine on the worm. A new worm is used for each different campaign/molarity. At the end of each trial we had to record what happened to the worm and what we saw under the microscope. The old worm was to be disposed in a bowl with everyone elses used worm.Results & informationThe first picture above shows how the worm looked under the microscope with just water. honoring that the vessels are spaced apart allowing the blood to period with ease. With the presence of caffeine the blood vessels of the worm relaxed or sepa rated more allowing blood to flow causing the heart to beat faster. The final picture shows what was saw under the microscope when the worm had nicotine in it. The vessels are more closer together fashioning it harder for the blood to flow. Decreased blood flow equals decreased heart rate. On a few attempts the worms died because at first I did not know that the worms lived on water, or because I would put to much of a declaration into the viewing chamber than the worm could take. The higher the concentration the more forceful the results. The pictures shown are only for the lowest molarity of caffeine and nicotine used in this lab.ConclusionMy hypothesis for this lab was correct. The effect of nicotine made the worm heart rate lower and the effect of caffeine made the heart rate speed up. Caffeine and nicotine effect worms and humans in the same way.