1 / 12

Cell Boundaries

Explore the structure and function of the cell membrane and cell wall, learn how diffusion occurs, predict cell behavior in different environments, and define active transport.

dereky
Download Presentation

Cell Boundaries

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 Boundaries Content Objectives: Compare & contrast the structure and function of the cell membrane & cell wall. Explain how diffusion occurs. Predict what happens to a cell in hypertonic, hypotonic, & isotonic environments. Define active transport.

  2. All cells have a Cell Membrane! • Cell membrane – a thin, flexible boundary that surrounds all cells. • The cell membrane controls what enters and leaves the cell and provides protection & support! Animal Cell Cell Membrane

  3. What are Cell Membranes made of? • Cell membranes are made of two layers of lipids, called a lipid bilayer. • The cell membrane also contains proteins that move materials in or out of the cell.

  4. CELL WALLS – FOUND IN PLANT CELLS, ALGAE, AND FUNGI • Cell walls – strong supporting structures around the cell membrane. • The main function of the cell wall is to support and protect the cell. • Cell walls are made of carbs and proteins. Plant Cell Cell Membrane Cell Wall

  5. Diffusion • Diffusion – particles tend to move from areas of high concentration to areas of low concentration. • When the concentrations are the same on both sides, it has reached equilibrium. Animal Cell NO ENERGYREQUIRED!!

  6. Facilitated Diffusion • Facilitated Diffusion – the cell membrane helps the diffusion of a substance. • Cell membrane uses protein channels. Animal Cell NO ENERGYREQUIRED!!

  7. Osmosis • Not all substances can cross cell membranes. • MEMBRANE: • Permeable = can be crossed • Impermeable = cannot be crossed • Osmosis - the movement of water across a selectively permeable membrane.

  8. How Does Osmosis Work? • Hypertonic – more concentrated Water Plasmolyzed!! Animal Cell

  9. How Does Osmosis Work? • Hypotonic – less concentrated Water Animal Cell

  10. How Does Osmosis Work? • Isotonic – equal concentrations Water Water Animal Cell

  11. Active Transport • Active Transport – the cell membrane moves materials AGAINST the concentration gradient. • Cell membrane uses protein channels to pump things in or out. Animal Cell ENERGY ISREQUIRED!!

  12. Cell Boundaries Content Objectives: Compare & contrast the structure and function of the cell membrane & cell wall. Explain how diffusion occurs. Predict what happens to a cell in hypertonic, hypotonic, & isotonic environments. Define active transport.

More Related