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Blood Experiment

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Blood Experiment Brief Sugar is an important part of the bloodstream. We can test blood by dropping it through copper sulphate. The more sugar it contains the faster it falls. The lab has been given a set of samples taken from 2 people before and after a meal. One person has been showing signs of excessive thirst and weight loss. The other has no such symptoms. Task Use your scientific knowledge to predict the expected results from both patients and to explain these predictions as fully as possible. Prediction I predict that for the normal person, the sugar level will rise after the meal and then drop. I predict that for the second person (who is a diabetic) the sugar level will rise higher and take longer to drop. I predict this because for a diabetic their pancreas doesn't make enough, or any, insulin. When the blood sugar levels rise, the pancreas monitors this and releases insulin into the blood. For a diabetic this doesn't happen so if the blood sugar levels rise it will take longer to drop. A diabetic has more sugar in their blood, so the blood is heavier, so the drop of blood will fall faster through the copper sulphate. Here are my predicted graph shapes: Results For person A: Time Intervals Tests 1pm 1.30pm 2pm 2.30pm 3pm 1 41.30 28.50 28.25 38.41 31.72 2 52.07 34.71 34.00 ...read more.


The graph shapes are nearly the same as those I drew in my prediction, which proves that my prediction is right, the graphs shapes and my results re as I expected them to be. The Explanation: 1. Insulin is secreted by the Islets of Langerhans which are special groups of cells in the pancreas. The Islets (little islands) are endocrine organs. 2. If you have a large carbohydrate meal, the level of glucose in the blood will start to rise as your digestive system turns all the starch and sugars in your food into glucose. 3. If you have not had a meal for several hours your blood sugar level will fall because your cells use up the glucose in aerobic respiration. 4. When your blood sugar level rises, the Islets of Langerhans secrete MORE insulin. 5. When your blood sugar level falls, the Islets of Langerhans secrete LESS insulin. 6. The main target organ for insulin is the liver. It is the liver which removes glucose from the blood by turning it into glycogen. 7. All other tissues in your body need insulin to help then respire glucose, so in a way they are also target organs. 8. If you eat, and eat, and eat, and eat, never mind how little exercise; there will come a time when there is no more room for glycogen in your liver. ...read more.


last could be slightly slower than usual because they would be slowed down by the other pieces of solution already in the tube. To try to avoid this I replaced the tube with a clean one when it looked like there was too much solution in there. To make my experiment completely fair I would have to use a clean tube for each reading but this was impractical as there weren't enough tubes and it would be a very lengthy process to keep cleaning out and replacing the tubes. Also it was really hard to get it so the drops of solution were all the same size so this might have had an effect on how fast the solution fell. I tried to make sure that all the solution drops were roughly the same size but if I was to do this experiment again I would try to be more careful and accurate. In my results for the person B at 1.30pm I have a range of readings from 29.19 seconds to 47.46 seconds. These readings are too far apart but all the readings for that time seem to be dotted throughout these two extremes. I think something went wrong with these readings so next time I would do these all again to try to get more accurate results. I think our experiment went well and I got the results I was expecting. ...read more.

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