1 / 16

Cell Membrane: The Gatekeeper of Life

Explore the functions and processes of the cell membrane, including diffusion, osmosis, and active transport. Learn how the membrane regulates the movement of molecules to maintain cellular balance.

acummings
Télécharger la présentation

Cell Membrane: The Gatekeeper of Life

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. Chapter 7-3 The Cell Membrane; Active & Passive Transport

  2. Gatekeeper • Semi-permeable • Regulates what comes in and out of the cell • Main components: proteins and phospholipids The Cell Membrane

  3. Found only in plant cells and bacteria cells • Main function is support Cell Wall

  4. Mixtures of substances • Ex. Salt + water; sugar + water Solutions

  5. The movement of molecules from an area of high concentration to an area of low concentration • Molecules tend to “spread out” • Requires no energy Diffusion

  6. When molecules are evenly spread throughout a space • Homeostasis Equilibrium Movie starring Christian Bale called “Equilibrium”

  7. The diffusion of water across a membrane • The cell membrane is selectively permeable • Watch the animation Osmosis

  8. Rule for Osmosis If the area outside the cell has more salt – then water will be sucked out of the cell

  9. U - Tubes

  10. "ISO" means the same Cells In Different Solutions

  11. Cell may burst, or organelles called “contractile vacuoles” remove excess water Hypo = less

  12. Cell will shrink or die, plants wilt Hyper = more Why is it dangerous to drink sea water? Why does pouring salt on a slug kill it?

  13. Requires no energy • Diffusion & Osmosis • Facilitated Diffusion – carrier proteins “help” molecules across the membrane Passive Transport

  14. Requires the cell to use energy • Proteins or Pumps found in the membrane move materials across ACTIVE TRANSPORT

  15. Taking “in” large molecules by the cell Endocytosis • Phagocytosis = “phood”, taking in food particles • Pinocytosis = liquid substances

  16. Removing large particles (waste) from the cell • Stuff “exits” the cell • Watch video at http://www.esnips.com/doc/2dad912f-9dcc-4936-89d9-1ae32c6125d2/Chapter-6---Endocytosis-and-Exocytosis • Or McGraw Hill Site EXOCYTOSIS

More Related