1 / 8

3.4 Diffusion and Osmosis

Learn about passive transport, the movement of materials across membranes due to concentration differences. Explore the processes of diffusion and osmosis, and understand the concept of equilibrium. Discover the different types of concentration gradients and the role of transport proteins.

afrancis
Download Presentation

3.4 Diffusion and Osmosis

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. 3.4 Diffusion and Osmosis • KEY CONCEPT • Materials move across membranes because of concentration differences. This is called PASSIVE TRANSPORT. Passive transport does not require cellular energy. • 2 types of passive transport • Diffusion • osmosis

  2. Diffusion • Molecules move from an area of • high concentration to an area of low concentration • The goal is to reach equilibrium

  3. Diffusion • Diffusion requires NO ENERGY! • Molecules diffuse down a concentration gradient. • (difference in concentration)

  4. Osmosis • Osmosis: the diffusion of water • Dialysis: the diffusion of solute • Solute + Solvent = Solution • (dialysis) (water)

  5. Diffusion and Osmosis • There are three types of concentration gradients: 1) isotonic

  6. Diffusion and Osmosis 2) hypertonic

  7. Diffusion and Osmosis 3) hypotonic

  8. Some molecules can only diffuse through transport proteins. • Some molecules cannot easily diffuse across the cell membrane. Facilitated diffusion is diffusion through transport proteins.

More Related