Bio PAPER 3

Bio PAPER 3 - The Role of Kidneys in Homeostasis Biology...

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The Role of Kidneys in Homeostasis Biology 124 Lab Section 139 Jennifer Moya
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1 Introduction This lab was preformed to better understand the the kidneys role in homeostasis. Homeostasis is the process in which the body tries to resolve three major issues; excrete metabolic wastes, regulate the concentration of ions as well as other chemicals and, maintain water balance (Crouch, Berger- 2004). Kidneys are bean-shaped organs located on the back side wall of the abdominal cavity. The kidneys contain about one million nephrons, fluids that are filtered from nephrons are drained by coll- ection ducts in the into the renal pelvis to be removed by the body (Crouch, Berger 2004). Urine formation only requires three three steps filtration, reabsorption and, tubular excretion. The kidneys are only one part of the bodies organs that help achieve homeostasis, other organs that help homeostasis are the lungs and liver. Homeostasis is important because if our body did not get rid of wastes, regulate chemicals, or maintain water balance the result would be fatal. We hypothesized that the kidneys help homeostasis by regulating the chemical composition of the blood by filtrating chemicals in the blood and by removing wastes from your body (urea, ammonia, drugs, toxic substances) . We hypothesized this based on information given by the lab manual (Crouch, Berger 2004) that said that urine formation requires three steps, filtration, reabsorption, and tubular excretion, these three steps allow the kidneys to do regulating and filtering chemicals, as well as remove wastes from the body. The first experiment was done to demonstrate how the kidneys regulate the chemical compost ion of the blood. We predicted that that the filter would filter out charcoal and copper sulfate and but not starch and water because charcoal and copper sulfate seem like harsher chemicals that the kidneys would want to filter out. Water was used as the control for this experiment because it is a small molecule and is easily filtered by the kidneys. The second experiment was done to demonstrate the separation of molecules by a selectively permeable membrane that permits diffusion of other molecules, otherwise known as dialysis. The control was the distilled water that dialysis was soaking in because anything other than the distilled water in the solution meant it tested positive. We predicted that sodium chloride starch and albumin would not diffuse through the membrane because too much of these left in the blood would be harmful to the body. Since the kidneys help produce urine, it is important to know the correct chemical composition
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Bio PAPER 3 - The Role of Kidneys in Homeostasis Biology...

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