jrtyj Essay

1670 Words Sep 25th, 2014 7 Pages
Osmosis

Case study
You are a veterinarian working in Indooroopilly and return from lunch to find a nurse treating a six year old kelpie, Baxter.
Baxter is very lethargic, has an increased heart rate, and when you pinch his skin the fold remains visible. The owner tells you that they knew something was wrong when, upon returning to the outdoor car park from a three hour shopping trip, they saw Baxter passed out on the back seat. The temperature in the car would have been very high and Baxter will have lost a lot of water through evaporation as he panted to stay cool. This loss of water would have reduced his blood volume, thereby increasing the concentration of the ECF.

Hypothesis
This is the hypotheses that you developed
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“When the osmotic pressure of the solution outside the blood cells is higher than the osmotic pressure inside the red blood cells, the solution is hypertonic.” (About, 2013). The water inside the cell diffuses across the membrane to equalize the concentration thus the cell shrivels due to loss of water. “When the solution outside of the red blood cells has a lower osmotic pressure than the cytoplasm of the red blood cells, the solution is hypotonic.” (About, 2013) again as an attempt to equalize the concentrations inside and outside of the cell, the water travels across the membrane into the cell, which causes it to lyse as it contains too much water.

4.
1)?

What biological reasons can you think of for the variations between data sets in your comparative analysis (Figure

The biological reasons causing variation between the comparative data would most likely have arisen as a result of the RBC in the sheep’s blood. While the groups had the same amount of sheep’s blood there was no way to determine wether or not they came from the same sheep. We don’t know how old our sheep were, where they lived, and under what circumstances the blood was taken. The containers of blood were on the table when we had arrived into the prac so we also did not know how long they had been sitting there and in what temperature. We also don’t know the specific methods in which the experiment was conducted or how each of the groups handled there blood samples.

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