UTF-8
Diffusion and Osmosis: Red blood cells and respiration
196230230
Diffusion and Osmosis: Red blood cells and respiration
Observing Diffusion Into and Out of Cells
Blood is a complex mixture of cells and a liquid called plasma. Red blood cells carry the oxygen from our lungs to every tissue in the body and carry carbon dioxide from our tissues back to our lungs. How does the oxygen know to go into the cell and the carbon dioxide to come out? The answer is connected to diffusion and how substances naturally tend to equalize concentrations.
Below are two models. One shows a red blood cell just as it enters a lung's capillary and one shows a red blood cell in a capillary outside of the lungs. Oxygen, carbon dioxide, and plasma are all represented in the models.
Scroll down to view each model, but answer the question below before running the models.
Model A
Note: Plasma is a complex solution of many molecules. The white balls
represent the water component in which those molecules are dissolved.
Model B
Note: Plasma is a complex solution of many molecules. The white balls
represent the water component in which those molecules are dissolved.
It will be helpful to see the above models in their initial states. If you have already run the models, it would be useful to reset them by using the button above.
Run the models (one at a time, so they are easier to observe), and see if your answers are correct.
1
true18
true16
20.0
20.0
true14true
20.0
14
40.0
40.0
40.0
40.0
40.0
1
40.0
1
40.0
org.concord.modeler.PageMultipleChoice
true
2
700
140
<html>
<head>
</head>
<body>
<strong><font size="4" face="Times New Roman, Times, serif">Before running
either of the models, state which model represents a red blood cell
entering a<br>lung capillary and which one represents a blood cell
entering a capillary outside of the lungs. </font></strong>
</body>
</html>
true
Model A represents the cell in a lung capillary and Model B represents the cell the non-lung capillary.
Model A represents the cell in a non-lung capillary and Model B represents the cell the lung capillary.
0
-111112
Line
40.0
40.0
1
40.0
Arial Black18
1
40.0
bloodKey.png
1
40.0
10true
10
1
40.0
10
1
40.0
org.concord.mw2d.activity.AtomContainer
DandOpage3$0.mmlfalse
1
40.0
1
40.0
Arial Black18
1
40.0
bloodKey.png10
10
1
40.0
Arial Black10
10true
10
1
40.0
10
Arial Black10
1
40.0
org.concord.mw2d.activity.AtomContainer
DandOpage3$1.mmlfalse10
1
40.0
40.0
reset.gif
40.0
1
40.0
org.concord.modeler.PageMultipleChoice
true
3
300
180
<html>
<head>
</head>
<body>
<strong><font size="4" face="Times New Roman, Times, serif">Which model
shows a higher concentration of oxygen inside of the cell when compared to
outside the cell?</font></strong>
</body>
</html>
true
Model A.
Model B.
Both Model A and B are the same.
1
-111112
Line
org.concord.modeler.PageMultipleChoice
true
3
300
180
<html>
<head>
</head>
<body>
<strong><font size="4" face="Times New Roman, Times, serif">Which model
shows a higher concentration of carbon dixoide outside of the cell when
compared to inside the cell?</font></strong>
</body>
</html>
true
Model A.
Model B.
Both Model A and B are the same.
1
-111112
Line
1
40.0
1
40.0
org.concord.modeler.PageTextArea
550
177
<html>
<head>
</head>
<body>
<strong><font size="4" face="Times New Roman, Times, serif">Explain why
the cell in Model A will pick up oxygen for delivery to other cells, and
why the cell in Model B will release oxygen to nearby cells that need it.
Be sure to talk about diffusion and the effect of concentration in your
answer.</font></strong>
</body>
</html>
-1
1
40.0
40.0
40.0
1
40.0
upArrowSmall.gifpage5.cml
1
60.0
59 25 2510
59 25 2510