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Learn about diffusion, osmosis, and active transport processes in cell membranes including facilitated diffusion and hypertonic solutions. Explore how active transport mechanisms like endocytosis and exocytosis function with the Na-K Ion Pump.
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What is the other name for the Cell Membrane? • Fluid Mosaic Model
Passive Transport • Requires no energy • Flows “downhill” from an area of higher concentration to an area of lower concentration.
Diffusion 1. Diffusion requires no energy 2. It is the movement of molecules from a high concentration to a low concentration
Facilitated Diffusion • Facilitated Diffusion uses a membrane protein to get molecules across the membrane • It is still diffusion so it requires no energy and moves from high to low concentration
Osmosis • Osmosis is the movement of water across a semi permeable membrane • Osmosis requires no energy
Active Transport • Active transport requires energy • Moves molecules from low concentration to high concentration • Requires use of special membrane proteins
Active Transport • Active transport also includes endocytosis and exocytosis • Endocytosis is when molecules are brought in to the cell through movement of the membrane • Exocytosis is when molecules are pushed out of the cell due to movement of the membrane
