Ex. 2B : Water, 0.9% NaCl, and 1.5% NaCl – Change in Specific Gravity over Time
ID: 3520124 • Letter: E
Question
Ex. 2B: Water, 0.9% NaCl, and 1.5% NaCl – Change in Specific Gravity over Time
We want to look at the kidney’s ability to deal with differences in tonicity of ingested solutions – that is of various salt concentrations. To do this we will evaluate data from urine samples in which specific gravity was measured for a hypotonic solution (distilled water), an isotonic solution (0.9% NaCl), and a hypertonic solution (1.5% NaCl). Specific gravity refers to the amount of solute in a fluid. As a fluid increases in specific gravity, it becomes more concentrated with solute. Likewise, a decrease in specific gravity indicates the fluid is becoming more dilute. Data was recorded in 20-minute intervals for 100 minutes total (See Tables 2B.1-2B.3). Generate a hypothesis. Then graph specific gravity vs. time for the three solutions (3 lines on same graph for comparison). Discuss your hypotheses and results.
8a) State your hypothesis for water, 0.9% NaCl, and 1.5% NaCl. Explain your reasoning, based on what you know about urinary physiology.
b)Discuss the results of this experiment.
Cemerate a bypathesiz Thea graph apeci ir gravity va. time For the three zolutioas 3 liae on same graph for comparison). Diseour kypotheses and resulta. Table 2B.1: Water Tine Vohme Rate ob)(Di) 110 mL 30 mL 160 mL 170 mL Specific Gravity 1.015 1.015 1.010 1.005 1.005 1.000 Caler PH 1.07light amber light yellow et yellow 20 60 80 100 light yellow 165 ml. 195 mL 8.25 9.75 Table 2B.2: 0.9% NaCl Time Volume Rate (ml/min) 20 60 100 85 mL 15 mL 15 mL 20 mL 45 mL 35 mL 0.75 0.75 1.00 2.25 1.75 Color Dark yellow light yellow light yellow light yellow vellow ight yellow Specific Gravity ?015 1.015 1.015 1.015 1.015 1.015 Table 2B.3: 1.5% NaCl Time Volume Rate ml min) Specific Gravitv 015 1.020 0 mL 20mL 10 mL 15 mL 15 mL 0 mL Color Light yellow yellow dark vellow dark yellow vellow ellow 60 1.025 0.75 100 .030 Ex 2B: Water, 0.9% NaCl, and 1.5% Nga-Change in Specific Gravity over Time 8a) State your hypothesis for water, 0.9% NaCL and 1.5% NaCL Explain your reasoning, based on what you kmow about urinary physiology Sb) Graph changes in urine specific gravity over time for water, 0 NaCI. You will have 3 lines Label the X-axis with Time and the Y-axis with Specific Gravity .9% NaC, and 1.5% 8c) Discuss the results of this experiment.Explanation / Answer
A) Hypothesis is that the specific gravity of urine will depend on concentration of solute on urine and rate will depend on the volume of solution.
B) results shows that
The large volume of water will increase urine output because of ADH inhibition and decreased specific gravity because of low secretion of solute in urine. And rate will also increase with increase of solution.
With 0.9-/- NaCl, as the solution is isotonic, so the urine rate will increase with increasing volume of solution ingested and no effect on specific gravity.
With 1.5-/- NaCl, as the solution ingested is hypertonic, there will be more secretion of solute in urine which will lead to increase in specific gravity with increase of solute.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.