Cell Transport Virtual Lab V2.docx

Cell Transport Virtual Lab V2.docx - Cell Transport Virtual...

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Cell Transport Virtual Lab Background information: A cell membrane permits some materials to pass through while keeping other materials out. Such a membrane is called “selectively permeable.” Under normal conditions, water constantly passes in and out of this membrane. This diffusion of water through a selectively permeable membrane is called osmosis . Like other substances, water diffuses from an area of higher concentration to an area of lower concentration . When the movement of water molecules in and out of a cell reaches the same rate, a state of equilibrium is reached. If the concentration of water molecules is greater outside a cell, then the solution is hypotonic to the cell. Water will move into the cell by osmosis. The pressure against the inside of the cell membrane will steadily increase. If the pressure becomes great enough, the cell membrane will burst. A solution is isotonic to the inside of the cell when there is the same concentration of water molecules on the inside and outside of the cell membrane. To maintain equilibrium, water molecules move into and out of the cell at the same rate. Suppose a living cell is placed in a solution that has a higher salt concentration than the cell has. Such a solution is hypertonic to the cell, because there are more salt ions and fewer water molecules per unit volume outside the cell than inside. Water will move from the area of higher water concentration (inside the cell) to the area of lower water concentration (outside the cell). The selectively permeable membrane does not allow salt ions to
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  • Fall '17
  • Osmosis, Paramecium cell, Elodea Cell

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