UTF-8Diffusion, Osmosis, and Active Transport: Osmosis.244245239111org.concord.modeler.text.LineIcon750.03010105<html>
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<strong>Diffusion, Osmosis, and Active Transport:</strong> Osmosis.
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false11org.concord.modeler.text.LineIcon750.085101015<html>
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<p class="mainidea">
All life requires water, and being able to regulate how much water
moves into or out of a cell is crucial. What affects the flow of
water into and out of cells?
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The diffusion of water into and out of our cells is of such importance
that it is given a special name - <strong>osmosis</strong>.
</p>
<p>
Cells need to maintain a certain amount of water inside their membranes.
Too much and they can explode, but too little and the cell’s machinery
will shut down. Use the model below to explore how the salt
concentration inside and outside of the cell affects the flow of water.
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<img height="23" width="702" src="osmosisTitle.png">
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<style type="text/css">
<!--
.style1 { font-size: 10px }
-->
</style>
<link type="text/css" href="bioStyles.css" rel="stylesheet">
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<table cellpadding="0" cellspacing="0" border="0" style="width: 730">
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<td align="right">
salt concentration
</td>
<td>
<select script3="script:mw2d:1:set %saltLeft %high;
set textbox[1].color (0,0,0,0); set textbox[1].background (0,0,0,0); set textbox[1].border 0;
set textbox[0].color (0,0,0,0); set textbox[0].background (0,0,0,0); set textbox[0].border 0; set textbox[0].shadow 0;
select atom within(%lx,%ly,%lwidth,%lheight);
remove;
set %currentNum 0;
while (%currentNum < %high);
add atom 0 (rand()*%lwidth,rand()*%lheight);
set %currentNum count(0,%lx,%ly,%lwidth,%lheight);
endwhile;
set %currentNum 0;
while (%currentNum < %high);
add atom 1 (rand()*%lwidth,rand()*%lheight);
set %currentNum count(1,%lx,%ly,%lwidth,%lheight);
endwhile;
set %currentNum 0;
while (%currentNum < (%totalAtoms-(%high*2)));
add atom 2 (rand()*%lwidth,rand()*%lheight);
set %currentNum count(2,%lx,%ly,%lwidth,%lheight);
endwhile;
if ((%saltLeft > 0) and (%saltRight > 0));
external disableRun.mws;
endif;" script2="script:mw2d:1:set %saltLeft %low;
set textbox[1].color (0,0,0,0); set textbox[1].background (0,0,0,0); set textbox[1].border 0;
set textbox[0].color (0,0,0,0); set textbox[0].background (0,0,0,0); set textbox[0].border 0; set textbox[0].shadow 0;
select atom within(%lx,%ly,%lwidth,%lheight);
remove;
set %currentNum 0;
while (%currentNum < %low);
add atom 0 (rand()*%lwidth,rand()*%lheight);
set %currentNum count(0,%lx,%ly,%lwidth,%lheight);
endwhile;
set %currentNum 0;
while (%currentNum < %low);
add atom 1 (rand()*%lwidth,rand()*%lheight);
set %currentNum count(1,%lx,%ly,%lwidth,%lheight);
endwhile;
set %currentNum 0;
while (%currentNum < (%totalAtoms-(%low*2)));
add atom 2 (rand()*%lwidth,rand()*%lheight);
set %currentNum count(2,%lx,%ly,%lwidth,%lheight);
endwhile;
if ((%saltLeft > 0) and (%saltRight > 0));
external disableRun.mws;
endif;" script1="script:mw2d:1:set %saltLeft 0;
select atom within(%lx,%ly,%lwidth,%lheight);
remove;
set textbox[1].color (0,0,0,255); set textbox[1].background (220,236,218,255); set textbox[1].border 2;" id="jumpMenu" selfscript3="//do nothing" selfscript2="//do nothing" selfscript1="enablecomponent 2 false" name="jumpMenu">
<option>none
<option>low
<option>high
</select>
</td>
<td align="right">
salt concentration
</td>
<td>
<select script3="script:mw2d:1:set %saltRight %high;
set textbox[2].color (0,0,0,0); set textbox[2].background (0,0,0,0); set textbox[2].border 0;
set textbox[0].color (0,0,0,0); set textbox[0].background (0,0,0,0); set textbox[0].border 0; set textbox[0].shadow 0;
select atom within(%rx,%ry,%rwidth,%rheight);
remove;
set %currentNum 0;
while (%currentNum < %high);
add atom 0 (rand()*%rwidth+%rx,rand()*%rheight);
set %currentNum count(0,%rx,%ry,%rwidth,%rheight);
endwhile;
set %currentNum 0;
while (%currentNum < %high);
add atom 1 (rand()*%rwidth+%rx,rand()*%rheight);
set %currentNum count(1,%rx,%ry,%rwidth,%rheight);
endwhile;
set %currentNum 0;
while (%currentNum < (%totalAtoms-(%high*2)));
add atom 2 (rand()*%rwidth+%rx,rand()*%rheight);
set %currentNum count(2,%rx,%ry,%rwidth,%rheight);
endwhile;
if ((%saltLeft > 0) and (%saltRight > 0));
external disableRun.mws;
endif;" script2="script:mw2d:1:set %saltRight %low;
set textbox[2].color (0,0,0,0); set textbox[2].background (0,0,0,0); set textbox[2].border 0;
set textbox[0].color (0,0,0,0); set textbox[0].background (0,0,0,0); set textbox[0].border 0; set textbox[0].shadow 0;
select atom within(%rx,%ry,%rwidth,%rheight);
remove;
set %currentNum 0;
while (%currentNum < %low);
add atom 0 (rand()*%rwidth+%rx,rand()*%rheight);
set %currentNum count(0,%rx,%ry,%rwidth,%rheight);
endwhile;
set %currentNum 0;
while (%currentNum < %low);
add atom 1 (rand()*%rwidth+%rx,rand()*%rheight);
set %currentNum count(1,%rx,%ry,%rwidth,%rheight);
endwhile;
set %currentNum 0;
while (%currentNum < (%totalAtoms-(%low*2)));
add atom 2 (rand()*%rwidth+%rx,rand()*%rheight);
set %currentNum count(2,%rx,%ry,%rwidth,%rheight);
endwhile;
if ((%saltLeft > 0) and (%saltRight > 0));
external disableRun.mws;
endif;" script1="script:mw2d:1:set %saltRight 0;
select atom within(%rx,%ry,%rwidth,%rheight);
remove;
set textbox[2].color (0,0,0,255); set textbox[2].background (220,236,218,255); set textbox[2].border 2;" id="jumpMenu" selfscript3="//do nothing" selfscript2="// do nothing" selfscript1="enablecomponent 2 false" name="jumpMenu">
<option>none
<option>low
<option>high
</select>
</td>
<td style="width: 155px" align="center" rowspan="2">
<input id="button" selfscript="enablecomponent 2 false; enablecomponent 3 true; enablecomponent 4 true; enablecomponent 0 false; enablecomponent 1 false;" value="run" script="script:mw2d:1:minimize 1 10; run;" type="submit" name="button">
  <input id="button2" selfscript="enablecomponent 2 true; enablecomponent 3 false;" value="stop" script="script:mw2d:1:stop;" type="submit" name="button2"><br><input id="button3" selfscript="enablecomponent 2 true; enablecomponent 3 false; enablecomponent 4 false; enablecomponent 0 true; enablecomponent 1 true;" value="reset" script="script:mw2d:1:stop;
select atom all;
remove;
set obstacle[0].x 22.2;
set %currentNum 0;
while (%currentNum < %saltRight);
add atom 0 (rand()*%rwidth+%rx,rand()*%rheight);
set %currentNum count(0,%rx,%ry,%rwidth,%rheight);
endwhile;
set %currentNum 0;
while (%currentNum < %saltRight);
add atom 1 (rand()*%rwidth+%rx,rand()*%rheight);
set %currentNum count(1,%rx,%ry,%rwidth,%rheight);
endwhile;
set %currentNum 0;
while (%currentNum < (%totalAtoms-(%saltRight*2)));
add atom 2 (rand()*%rwidth+%rx,rand()*%rheight);
set %currentNum count(2,%rx,%ry,%rwidth,%rheight);
endwhile;
set %currentNum 0;
while (%currentNum < %saltLeft);
add atom 0 (rand()*%lwidth,rand()*%lheight);
set %currentNum count(0,%lx,%ly,%lwidth,%lheight);
endwhile;
set %currentNum 0;
while (%currentNum < %saltLeft);
add atom 1 (rand()*%lwidth,rand()*%lheight);
set %currentNum count(1,%lx,%ly,%lwidth,%lheight);
endwhile;
set %currentNum 0;
while (%currentNum < (%totalAtoms-(%saltleft*2)));
add atom 2 (rand()*%lwidth,rand()*%lheight);
set %currentNum count(2,%lx,%ly,%lwidth,%lheight);
endwhile;
if (%cellMsgOn);
select image 3;
remove;
set %cellMsgOn 0;
endif;" type="submit" name="button3">
</td>
</tr>
<tr>
<td align="right" colspan="2">
<input id="checkbox" script_selected="script:mw2d:1:set obstacle[0].density 0.05; set %memMoving 1;" script_deselected="script:mw2d:1:set obstacle[0].density 100000; set %memMoving 0; if (%cellMsgOn); select image 3; remove; set %cellMsgOn 0; endif;" type="checkbox" name="checkbox">
</td>
<td align="left" colspan="2">
moveable membrane
</td>
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<body class="question">
<p class="question">
Osmotic pressure is related to salt concentrations (or other dissolved
substances) in what way?
</p>
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trueHigh concentrations cause high osmotic pressures.Low concentrations cause high osmotic pressures.High concentrations cause low osmotic pressures.It depends on what is dissolved in the water.0-373738Lineorg.concord.modeler.PageMultipleChoicetrue3371200<html>
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<body class="question">
<p class="question">
If you want water to flow out of the cell faster than into the cell you
should:
</p>
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trueput the cell in pure distilled water.<html>put the cell in a low concentration of salt or sugar water.</html><html>put the cell in a high concentration of salt or sugar water.</html>2-373738Line18.0org.concord.modeler.PageMultipleChoicefalse4471180<html>
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<p class="question">
Cells generally stay in equilibrium with their surroundings. What are
two ways you know the cell has reached equilibrium?
</p>
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trueWater stops flowing into and out of the cell.The concentrations inside and outside of the cell are the same.The osmotic pressure inside and outside of the cell is the same.The cell gets as small as it possibly can.1 2-373738Lineorg.concord.modeler.PageTextArea271180<html>
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<p class="question">
Describe the similarities and differences between diffusion and osmosis.
</p>
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falseLine18.0org.concord.modeler.PageTextBox400.0200.0<html>
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<p style="margin-top: 0">
Once you understand the above material, <a href="diffusion.membraneR3.cml"><font>click
here</font></a> to see a picture of the affect of osmosis on animal and
plant cells and answer a challenge question.
</p>
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