Transport Mechanisms through Cell Membranes

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Transport Mechanisms through Cell Membranes

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1. Transport Mechanisms through Cell Membranes Passive vs. Active Transport

2. Passive Transport Movement from high to low concentrations. Does NOT require energy. 3 Types of Passive Transport: Diffusion Osmosis Facilitated Diffusion

3. Diffusion (passive) Movement of molecules from high concentration to low concentration. Why can you smell popcorn from another room? Why does food coloring mix by itself? How does oxygen get into your blood?

4. Osmosis Diffusion of WATER!!!!! What happens when you eat popcorn? Why do your fingers get wrinkles when you swim too long? Have you ever put salt on a slug???

5. Three Types of Osmosis Hypertonic Solutions that have MORE “stuff” and less water than the cell. Water will move out of cell.

6. Isotonic Solution has the SAME amount of “stuff” and water as the cell. There is no net gain or loss of water from the cell.

7. Hypotonic Solution has LESS “stuff” and more water than the cell. Water will move INTO cell.

8. Selectively Permeable = cell membrane will only allow some things through! Large macromolecules and charged ions can NOT get through the lipid bi-layer!!!

9. Facilitated Diffusion Diffusion with the help of “channel” proteins. - Usually because molecules are too big or have a charge and can not go through the membrane alone.

11. Active Transport Movement from low to high concentration. Requires ENERGY. 3 Types of Active Transport: - Protein PUMPS - Endocytosis - Exocytosis

12. Protein “Pumps” Proteins that move molecules from Low concentration to High concentrations - requires energy.

13. Endocytosis Active transport of large particles INTO the cell, by surrounding them with the cell membrane.

14. Exocytosis Active transport of substances OUT of the cell using the cell membrane.

15. Concentration Mountain

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