UTF-8Diffusion, Osmosis, and Active Transport: Concentration and breathing.244245239111org.concord.modeler.text.LineIcon750.03010105<html>
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<strong>Diffusion, Osmosis, and Active Transport:</strong> Concentration
and breathing.
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Why do red blood cells absorb oxygen in our lungs and release it
to the rest of our body? Why not the other way around?
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You have seen that concentration affects the overall flow of a substance
across a membrane. If a cell moves (or is moved) into an area of low or
high concentration, it will cause the concentration inside the cell to
change. For some single-celled creatures, this is how they get nutrients
to be absorbed into their cells. For red blood cells, this is part of
the story that helps to explain how they pick up oxygen in your lungs
and deliver it to the rest of your body.
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Use the model below to move a red blood cell into environments with
different concentrations of oxygen and observe how the oxygen
concentration inside of the red blood cell changes when you put it in
different environments.
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<p class="firstp" style="margin-left: 60px; margin-top: 3px; text-indent: -32px; width: 500px">
Note: Real red blood cells are not shaped like a square. This shape was
used for technical reasons to make the model easier to construct.
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What happens to the oxygen concentration of the cell when you move it to
a new environment?
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trueIt stays the same.It goes up.It goes down.It goes up or down until it reaches equilibrium.3-ff0100Lineorg.concord.modeler.PageTextArea371180<html>
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Explain how a red blood cell delivers oxygen from your lungs to the rest
of your body.
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