1 / 30

Cell Membrane Transport

Cell Membrane Transport. Cell membrane transport. There are 2 types of cell membrane transport: Passive Transport Things flow from High to low Active Transport Things flow from Low to high. Another perspective on passive and active transport. Passive Transport. Diffusion

step
Télécharger la présentation

Cell Membrane 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 Membrane Transport

  2. Cell membrane transport • There are 2 types of cell membrane transport: • Passive Transport • Things flow from High to low • Active Transport • Things flow from Low to high

  3. Another perspective on passive and active transport

  4. Passive Transport • Diffusion • The movement of particles from areas of high concentration to low concentration • http://www.indiana.edu/~phys215/lecture/lecnotes/diff.html • http://www.biosci.ohiou.edu/introbioslab/Bios170/diffusion/Diffusion.html

  5. Equilibrium • When is equilibrium reached when discussing cell membrane transport? • When the concentrations of particles are the same on both sides

  6. Facilitated Diffusion • Particles flow from high concentration to low concentration but this time they need the help of proteins to get through the cell membrane.

  7. Facilitated diffusion

  8. Passive transport • Osmosis • The diffusion of water across a selectively permeable membrane • Important in maintaining cell homeostasis • Water flows to side of membrane where the water concentration is lower until equilibrium is reached

  9. Osmosis • Osmosis is controlled by the amount of solutes on either side of a membrane

  10. Remember, this is important, Osmosis deals with what? • The movement of particles • The movement of glucose • The movement of water • The movement of lipids

  11. Osmosis – Types of Solutions • When dealing with osmosis, water can either move into the cell or out of it. • The solute can not move to equal out the solution so the water has to. • We describe the solutions that cells are in as either hypotonic, isotonic, or hypertonic. 90% What are the concentrations? 40%

  12. Isotonic Solution • Isotonic solution – Concentration of solute is the same in the cell and the area around the cell. • Give me an example of an isotonic solution that some of you use everyday

  13. Isotonic solution

  14. Hypotonic Solution • Hypotonic Solution – Concentration of solute is lower in the solution than in the cell. • Where is water going to move in order to reach equilibrium (Equal concentrations)? • Inside the cell

  15. Hypotonic solutions • Since water moves into the cell the cell can explode • http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/Osmosis.htm • So, Hypotonic solution, low concentration of solute, cell can explode

  16. Plant and animal cells in a hypotonic solution

  17. Hypertonic Solution • Hypertonic solution – concentration of solute is higher in the solution than in the cell. • Where is water going to move in order to reach equilibrium (Equal concentrations)? • Outside the cell

  18. Hypertonic solutions • Since water moves out of the cell the cell will shrink • http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/Osmosis.htm • So, Hypertonic solution, high concentration of solute, cell will shrink

  19. Plant and animals cells in a Hypertonic Solution

  20. Osmosis • http://www2.nl.edu/jste/osmosis.htm • http://www.coolschool.ca/lor/BI12/unit4/U04L06/rbc.html

  21. The following diagram demonstrates what type of solution? = solute • Hypotonic • Isotonic • Hypertonic

  22. In the following diagram which way is water going to move? = solute • Inside the cell • Outside of the cell • Both 1 and 2

  23. The following diagram demonstrates what type of solution? = solute • Hypotonic • Isotonic • Hypertonic

  24. In the following diagram which way is water going to move? = solute • Inside the cell • Outside of the cell • Both 1 and 2

  25. Active Transport • Molecules move from low concentration to high concentration • Requires energy….why?

  26. Other membrane transport activities that require energy • Endocytosis • Engulfing of large particles or liquids from outside the cell

  27. 2 types of Endocytosis • Phagocytosis • Engulfing of large particles from outside the cell • Pinocytosis • Engulfing of liquids from outside the cell

  28. Other membrane transport activities that require energy • Exocytosis • Release of large particles or liquids from inside the cell Outside the cell Inside the cell

  29. This diagram is an example of what membrane transport? • Diffusion • Facilitated diffusion • Endocytosis • Exocytosis

  30. This diagram is an example of what membrane transport? • Diffusion • Facilitated diffusion • Endocytosis • Exocytosis

More Related