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1.4: Membrane Transport

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Describe simple diffusion.



Understanding: Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport.
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Describe simple diffusion.



Understanding: Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport.
Net movement of molecules from areas of higher concentration to areas of lower concentration, without the input of energy (passive).
Image: *Describe simple diffusion.* Understanding: Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport.
Explain two examples of simple diffusion of molecules into and out of cells.



Understanding: Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport.
1. Gas exchange by diffusion in lung alveoli cells.

2. Gas exchange by diffusion through eye cornea cells.
Image: *Explain two examples of simple diffusion of molecules into and out of cells.* Understanding: Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport.
Outline factors that regulate the rate of diffusion.



Understanding: Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport.
Concentration of the diffusing molecule
Increase concentration gradient, increase diffusion rate

Temperature
Increase temperature, increase diffusion rate

Pressure
Increase pressure, increase diffusion rate
Describe facilitated diffusion.



Understanding: Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport.
Movement of molecules from higher to lower concentration through a transport protein without the input of energy.
Image: *Describe facilitated diffusion.* Understanding: Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport.
Describe one example of facilitated diffusion through a protein channel.



Understanding: Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport.
The CFTR protein is a channel protein that controls the flow of H2O and Cl- ions into and out of cells inside the lungs. When the CFTR protein is working correctly, as shown in Panel 1, ions freely flow in and out of the cells. However, when the CFTR protein is malfunctioning as in Panel 2, these ions cannot flow out of the cell due to a blocked channel. This causes Cystic Fibrosis, characterized by the buildup of thick mucus in the lungs.
Image: *Describe one example of facilitated diffusion through a protein channel.* Understanding: Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport.