Today we wrapped up our investigation with the dialysis tubing. We used this as a model of capillaries to learn about osmosis and diffusion.
To survive we rely on the the diffusion of oxygen into our blood from our lungs and the diffusion of carbon dioxide from our blood into our lungs.
We also saw that only the red food coloring and the water were able to move through the membrane, but oil and the black food coloring didn't move through membrane. From this we learned that membranes are selectively permeable.
Homework: you have a quiz on the circulatory and respiratory system.
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