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Cell Boundaries

Cell Boundaries. Honors Biology. Cell Membranes. One of the most important functions of a cell membrane is :. to regulate the movement of molecules into and out of a cell. A cell membrane is said to be __________________________

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Cell Boundaries

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  1. Cell Boundaries Honors Biology

  2. Cell Membranes • One of the most important functions of a cell membrane is: to regulate the movement of molecules into and out of a cell

  3. A cell membrane is said to be __________________________ • Which means only specific kinds of molecules can get through the membrane • Another word for it is ______________________ Selectively Permeable Semipermeable

  4. 3. Selectively Permeable Cell membranes let some molecules enter a cell, but prevents other molecules from getting in. Can EnterCan Not Enter - Water - Small Molecules (O2 & CO2) - Non-polar lipids - Macromolecules - Ions (Na+,Cl-) - Hydrophilic molecules (glucose)

  5. 5. Concentration The concentration of a solution is: The mass of the SOLUTE divided by the volume of the SOLUTION For example: 10g/1L The more solute per volume equals a greater concentration.

  6. 6. Diffusion The movement of molecules from an area of high concentration to an area of lower concentration

  7. Example of Diffusion: • Beaker of water. Add salt to the water. • Will all of the water be salty or just the side of the beaker that you dumped the salt into? • When you add salt the salt will diffuse to all of the water.

  8. Example of Diffusion: • The smell of popcorn after it’s been popped. • Does the smell of popcorn stay where the popcorn was popped? Why or why not?

  9. Diffusion http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_diffusion_works.html

  10. Osmosis The diffusion of water. The movement of water from a high water concentration to a low water concentration.

  11. Osmosis http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works.html

  12. Hypotonic Solution has a lower solute concentration than the cell Water enters the cell, animal cells can expand and possibly burst.

  13. Isotonic The concentration of the solutes is the same inside and outside the cell

  14. Hypertonic Solution has a higher solute concentration than the cell Water leaves the cell, animal cells can shrink.

  15. Facilitated Diffusion The movement of specific molecules across cell membranes through protein channels.

  16. Facilitated Diffusion http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_facilitated_diffusion_works.html

  17. Active Transport Energy requiring process that moves material across a cell membrane against a concentration difference.

  18. Active Transport http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_the_sodium_potassium_pump_works.html

  19. Overview

  20. Endocytosis: Taking material in to the cell through cell membrane pockets Phagocytosis: Solids or large molecules moved Pinocytosis: Liquids moved

  21. Exocytosis: Releasing material from the cell

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