1 / 20

Cell Transport

Cell Transport. 7-3 Pgs. 182-189. Cell Membrane. Cell membrane regulates what leaves and enters the cell. It is a lipid bilayer with proteins embedded in the layer. Phospholipids. Phosphate head- polar “likes” water Lipid tail- 2 fatty acids- non-polar- does not “like” water.

tymon
Télécharger la présentation

Cell Transport

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Cell Transport 7-3 Pgs. 182-189

  2. Cell Membrane • Cell membrane regulates what leaves and enters the cell. • It is a lipid bilayer with proteins embedded in the layer.

  3. Phospholipids • Phosphate head- polar “likes” water • Lipid tail- 2 fatty acids- non-polar- does not “like” water

  4. Phospolipid Bilayer • There are 2 types of proteins in the lipid bilayer • Integral Proteins- transport substances across membrane • Peripheral Proteins- bind to the bilayer temporarily, perform various cellular processes.

  5. Phospholipid Bilayer • Cholesterol plays an important role in maintaining the integrity of the membrane. • Keeps it firm and from becoming too permeable. • Carbohydrates- Act as cell markers, allow cells to identify each other.

  6. Cell Membrane Video • http://www.youtube.com/watch?v=moPJkCbKjBs

  7. Diffusion • All cells must exist in a liquid environment in order to survive. • A solution is a mixture of two or more substances. • Solute- substance dissolved into the solvent • Solvent- substance solute dissolves into. • Ex- iced tea mix is the solute, water is the solvent

  8. Diffusion • Particles are constantly moving in a solution. • Particles tend to move from an area of high concentration to an area of low concentration, this is called diffusion. • Movement from high to low concentration is called the concentration gradient

  9. Diffusion

  10. Equilibrium • Particles move from high to low conc. until they are the same throughout the system, this is called equilibrium

  11. Diffusion • Since particle movement is random, diffusion occurs across the membrane without the use of energy. • Called Passive Diffusion

  12. Osmosis • Osmosis is the diffusion of water across a selectively permeable membrane.

  13. Osmosis • Water will move across a membrane until the concentrations of water and the solute are equal, this is an isotonic solution. • Hypertonic solution- when there is more solute then water. concentrated • Hypotonic solution- when there is more water then solute. dilute

  14. Facilitated Diffusion • Proteins in the cell membrane allow some substances pass through easier then others. • Still follows concentration gradient • Ex- doorman at a club, lets some people in easier then others

  15. Active Transport • Sometimes particles have to move from low to high concentration, against the concentration gradient. • This requires energy and is called active transport. • Ex- swimming against the current of a river. • Use proteins to carry particles across

  16. Endocytosis and Exocytosis • Particles that are too large to pass through the membrane other ways • Endocytosis- the cell membrane folds around an object and envelops it.

  17. Endocytosis and exocytosis • 2 types of endocytosis • Phagocytosis- used for taking in food particles • Pinocytosis- used for taking in liquids

  18. Exocytosis • Exocytosis is a process used to release substances from the cell. • Vacuole fuses with the cell membrane and forces contents out of cell

More Related