1 / 39

Transport through the Cell Membrane

Transport through the Cell Membrane. Passive Transport. Does not expend cellular energy for the movement to take place Ex-rolling down a hill. 3 types:. Diffusion Osmosis Facilitated Diffusion. I. DIFFUSION:. Definition: Transport of molecules (in general)

trixie
Download Presentation

Transport through the Cell Membrane

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. Transport through the Cell Membrane

  2. Passive Transport • Does not expend cellular energy for the movement to take place • Ex-rolling down a hill

  3. 3 types: • Diffusion • Osmosis • Facilitated Diffusion

  4. I. DIFFUSION: Definition: • Transport of molecules (in general) • From an area of higher concentration to an area of lower concentration • Until equal distribution of concentrations reached in all areas (EQUILIBRIUM) • Due to the random movement of molecules

  5. Conceptual Diagram:

  6. Review of the Types of Membranes: • Permeable • Impermeable • Semi-permeable

  7. Permeable • ALL types of molecules can get through, regardless of size or charge.

  8. Impermeable (non-permeable) • NO molecules can get through

  9. 3. SEMI-PERMEABLE !!!: • SOME MOLECULES CAN GET THROUGH • Very small or • Non-charged

  10. Example: • If you had glucose molecules and starch molecules, which ones do you think could get through after 24 hours and why? The membrane is permeable to both. 30% NaCl in H2O 4% C6H12O6 in H2O 15% NaCl 2% C6H12O6 15 % NaCl 2% C6H12O6

  11. Definitions • Solute: • what gets dissolved • Solvent: • What does the dissolving, more plentiful that solute • Solution: • the mixture of solutes and solvent • Example: H2O and NaCl Solute: NaCl Solvent: H2O Solution: H2O and NaCl

  12. OSMOSIS: Definition: • Diffusion (movement) of H2O • from to high to low concentration • THROUGH A MEMBRANE • until equilibrium

  13. OSMOSIS:

  14. OSMOSIS:

  15. How do you get different concentrations of water (2 ways)? • Change the amount of solute or solvent. • Add a membrane

  16. 3 Types of Solutions (outside of cell): • Hypertonic • Hypotonic • Isotonic

  17. Hypertonic: • MORE • More solute, less solvent (H2O) 80% water 90% water

  18. 2. Hypotonic: • LESS • Less solute, more solvent

  19. 3. Isotonic: • EQUAL • Equal amounts of solute/solvent concentrations on both sides of membrane

  20. Consequences: • Hypertonic PLASMOLYSIS (cell shrinking) • Examples: • Drinking out of ocean when you are dying of thirst or • Placing a fresh water fish in salt water… 

  21. Consequences:

  22. Consequences: • Hypotonic Cytolysis (cell bursting) • Examples: • Place a salt water fish in fresh water  • Red Blood Cells in pure water

  23. Turgor Pressure = Osmotic Pressure • As a result of osmosis, extra water molecules accumulate on one side of membrane and cause pressure on the membrane  “Turgor” • Example: water

  24. III. FACILITATIVE DIFFUSION: • Protein Channels in the cell membrane accept only specific particles, like a lock accepts a particular key.

  25. III. FACILITATIVE DIFFUSION:

  26. III. FACILITATIVE DIFFUSION: • Many of these protein channels are “two-way” and are called PORES. • These transport molecules ions or molecules (solutes) through membranes in either direction

  27. III. FACILITATIVE DIFFUSION: • Like an open door allows you to pass into or out of a room. • Different solute particles fit different pores • This depends on • Size • Polarity • Shape of molecule • Ex. Glucose

  28. III. FACILITATIVE DIFFUSION: • When a solute that is plentiful on one side of membrane, • they will pass by diffusion toward other side with the lower concentration. • Until concentration becomes equal on both sides

  29. DON’T FORGET, • THESE WERE ALL • PASSIVE TRANSPORT • SO THE CELL DID NOT NEED TO EXPEND ANY NRG TO MAKE IT HAPPEN!!!!!

  30. Passive Transport Vocabulary Passive Transport Concentration Gradient Diffusion Equilibrium Osmosis Facilitated Diffusion Solute Solvent Solution Hypertonic Hypotonic Plasmolysis Isotonic Cytolysis Osmotic (Turgor) Pressure

  31. EXIT SLIP • Explain what will happen to the Gummy Bear (made of sugar) when it is put in a beaker of distilled water over night. • Use the terms: Concentration Gradient, Osmosis, Solute, Solvent.

More Related