Movement IN and OUT of Cells

1. MovementIN and OUT of Cells

2. Substances move in and out through the cell membrane • Moving from high to low concentration DOES NOT REQUIRE ENERGY by the cell: Called Passive Transport

3. When the cell USES ENERGY to transport materials in or out: called Active Transport During active transport, molecules (like carbs., H₂0, O₂, CO₂) move from LOW to HIGH concentration

4. Moving Water • Osmosis = The diffusion of water across a semi-permeable membrane

5. Remember that… • Diffusion = movement of molecules from high to low concentration • Semi-permeable membrane = allows only certain things in or out • Concentration gradient = the unequal distribution of molecules

6. So…. osmosis is when water molecules move from where there is a lot to where there is less by going through a semi-permeable membrane

7. 3 Types of Solutions • Isotonic = concentration of dissolved substances is the same inside and outside of the cell • therefore…water moves EQUALLY IN and OUT

8. Hypertonic = concentration of dissolved substances is greater outside than inside of the cell • therefore…water moves OUT of the cell

9. Hypotonic = concentration of dissolved substances is greater inside than outside of the cell • therefore…water moves INTO the cell