BIO 1140 Lecture Notes - Lecture 2: Ethylene Glycol, Hemolysis, Osmotic Pressure

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Spontaneous movements of molecules through the membrane of an animal cell-
permeability of the red blood cell
By Laura A. Sands
7848911
BIO 1140 Section C7
Demonstrators:
Gleb Mironov and
Rosana Soares
February 24, 2015
Department of Biology
University of Ottawa
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Document Summary

Mean observed timea (seconds) and standard error (+/-) of data of hemolysis in sheep red blood cells in 5(n=5) different solutions. 1200. 00d a time began immediately when the sheep red blood cells and solutions were mixed. Average time of three separate test tube observations per solution c hemolysis time is less than two seconds, occurred instantaneously d hemolysis time is greater than 1200 seconds. Tonicity is the relative concentrations of solutes in the fluid inside and outside of the cell. When the erythrocytes (red blood cells) are placed in a hypotonic environment, water enters the cell to decrease the concentration of solutes within the inner environment of the cell, resulting in the cell volume increasing. If there is a maximal amount of water within the plasma membrane showing the environment of the cell as very hypotonic it will cause the plasma membrane to tear, resulting in a process of hemolysis in red blood cells.

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