![]() According to our results, we accept our hypothesis because after drinking water, the osmolality of the fluid decreases. Yes our group experienced gradual declining values becoming closer to 1.000 over time for specific gravity. ![]() Did your group experience a change in specific gravity over time? If so, in which direction? Does the change in specific gravity fit with what you would predict given your particular treatment? Explain why or why not.Ī4. This is followed by excretion of a large volume of dilute urine. According to our results, we accept our hypothesis because the kidneys go through water reabsorption in order to maintain the osmotic gradient. The volume increased after 30 minutes as well as after 60 minutes, followed by a decline after 90 minutes. Yes our group experienced volume changes in urine. Did your group experience a change in urine volume over time? If so, in which direction? Does the change in urine volume fit with what you would predict given your particular treatment? Explain why or why not.Ī3. Treatment Assigned: Water, in which there are no other added ingredientsĪ)Body fluid osmolarity - Excess amount lowers antidiuretic hormone, in turn decreases osmolarity of interstitial fluid.ī)Urine output (volume) - Due to the re-absorption of water throughout the collecting duct, urine output (volume) becomes a larger quantityĬ)Urine specific gravity - Due to the re-absorption of water throughout the collecting duct, filtrates become less present making the urine concentration become more dilute (Marieb & Hoehn, 2013, pgs. Specifically, explain how the intake of each ingredient (describe each separately!) should influence: A) body fluid osmolarity, B) urine output (volume) and C) urine specific gravity.Ī2. caffeine, sugar, artificial sweeteners, sodium) that may have influenced the production of your urine. Describe any ingredients in your treatment (i.e. ![]() Name the treatment to which you were assigned in activity 5. Results of Chemstick tests were generally normal for most of the subjects except for one subject who was on menstruation cycle therefore red blood cells were externally passed onto the urine (Hematuria: Blood in the Urine, 2012). ![]() How did the results of your Chemstick Test compare to the normal/expected values you located in your book or on the Internet? Were any of your test results abnormal? If so, give a logical explanation as to why (for ex: women who are menstruating may test positive for red blood cells in their urine). The rest of the water becomes excreted in the form of dilute urine. Since there is a decrease in the production of ADH, the kidneys allow more water to be reabsorbed in response to the osmotic gradient. If aldosterone is present, the DCT and collecting duct cells can remove Na+ and selected other ions from the filtrate, making the urine that enters the renal pelvis even more dilute (p. When we are overhydrated, ADH production decreases and the osmolality of urine falls as low as 100 mOsm. This will occur at each time interval of 30 minutes, 60 minutes, and 90 minutes.Īccording to Marieb & Hoehn (2013), the job of the kidney is to maintain the osmotic gradient during the formation of urine. Water, Time (at different intervals labeled as: time zero, after 30 mins, after 60 mins, after 90 mins)ĭrinking water should cause an increase in urine output (volume), while the salt concentration and specific gravity should decrease. Ĭompare the specific gravity, volume, and salt concentration of urine samples after drinking water. To determine the pH, physical properties, specific gravity, and chemical compositions of urine samples in the lab.
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