The document discusses various processes of cell transport, including passive transport mechanisms like diffusion and osmosis that move materials across the cell membrane towards equilibrium without energy usage, as well as active transport processes like endocytosis, exocytosis, and facilitated diffusion that move materials against concentration gradients by using energy. It introduces key terms related to cell transport and membrane structure, and outlines the different needs that must be met to maintain homeostasis within the cell.

1. Movement Through A Membrane (Cell Transport)

2. A few terms… Concentration – ratio or proportion of solute to solvent Diffusion – Movement of materials across the cell membrane Homeostasis – balance of materials necessary for life, equilibrium

3. Add these! Solvent – Liquid water Solute – solid (salt or sugar)

4. Cell Membrane Fluid Mosaic Model Phospholipid Bilayer Transport Proteins Selectively Permeable

6. What Needs to go Across Water Food (Glucose) Raw materials (Proteins) Waste Finished proteins

7. Uses No Energy Osmosis Passive Transport Facilitated Diffusion High conc  low

8. Osmosis Diffusion of water across the membrane

9. Diffusion/Passive Transport Movement of other materials across the cell membrane Facilitated Diffusion –large molecules get help across the cell membrane Transport Proteins are “doors”

10. Passive Transport Equilibrium Balance of materials on both sides of the membrane

11. Describing Solutions by their Effect on Cells

12. Uses Energy Active Transport Low conc  high Endocytosis/Exocytosis

13. Endocytosis Materials en ter the cell Cell membrane “pinches in” and forms vesicle inside the cell

14. Exocytosis Materials ex it the cell Membrane wrapped particles merge with the cell membrane and are pushed into the environment

15. Which one is it? A B

16. Homeostasis Dynamic Equilibrium Constant change in order to stay in balance