UTF-8Diffusion, Osmosis, and Active Transport: Making an electric potential.244245239111org.concord.modeler.text.LineIcon750.03010105<html>
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<strong>Diffusion, Osmosis, and Active Transport:</strong> Making an
electric potential.
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false11org.concord.modeler.text.LineIcon750.095101015<html>
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Frequently cells need to keep high concentrations of some chemical
inside, or they need to keep other chemicals out (low
concentration inside). What happens when you actively move ions
into or out of a cell?
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Through the processes of osmosis and diffusion, nature tends toward a
state where concentrations of everything are equalized. However, there
are times when it is necessary to create a situation where the
concentrations are not equal. Concentration differences between the
inside and outside of cells help to power the electrical signals in your
nerves, give you stength to flex your muscles, and allow your cells to
control the flow of water through osmosis.
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Below is a model showing a cell membrane, which, as you have seen, is
not permeable to ions. <strong>Try moving ions from one side of the
membrane to the other. </strong><a href="script:page:0:message moveIonsHelp.html">(help?)</a>
Do this until you build up a significant difference in the
concentrations inside and outside of the cell, and run the model. Can
you think of different ways to try this out?
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<input name="checkbox" script_selected="script:mw2d:1:select element 2; set visible off; select atom none; set %waterHidden 1;" id="checkbox" script_deselected="script:mw2d:1:select element 2; set visible on; select atom none; set %waterHidden 0;" type="checkbox">
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hide water
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<span class="style1">Note: The size of the ions in this model are
larger<br>to make them easier to grab with the mouse.</span>
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-9265848.01org.concord.modeler.PageMultipleChoicetrue4371240<html>
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What must be done to get an electric potential (a voltage) across the
membrane?
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trueMove all the water to one side.Make the concentrations equal inside and out.<html>Make the concentrations of at least one ion different inside and out.</html><html>Make the concentrations of both ions different inside and out.</html>2-373738Lineorg.concord.modeler.PageMultipleChoicetrue5371240<html>
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How can you get the maximum voltage across the cell membrane?
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trueMove all the water to one side.Move all the positive to one side.Move all the negative to one side.Move all of the ions both + and - to one side.<html>Move all the positives to one side and negatives to the other.</html>4-373738Line81org.concord.modeler.PageTextBox750.032.0<html>
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