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Passive and Active Transport Movement of material into and out of cells

Dec 27, 2015

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  • Slide 1
  • Passive and Active Transport Movement of material into and out of cells
  • Slide 2
  • Passive transport is the movement of substances across the cell membrane without the use of energy by the cell
  • Slide 3
  • Diffusion is the movement of a substance from an area of high concentration to an area of lower concentration
  • Slide 4
  • Osmosis is the diffusion of free water molecules across a selectively permeable membrane.
  • Slide 5
  • Ion Channels Ion channels are proteins that have a pore through which ions can cross the cell membrane. Ions cannot diffuse across the cell membrane due to the lipid bi-layer. Ion channels move ions from an area of high ion concentration to an area of low ion concentration (down the ions concentration gradient).
  • Slide 6
  • Facilitated Diffusion In facilitated diffusion, a carrier protein transports a substance across the cell membrane down the concentration gradient of the substance
  • Slide 7
  • Active Transport Active transport is the movement of a substance against the concentration gradient of the substance. Active transport requires cells to use energy
  • Slide 8
  • Sodium-Potassium Pump In animal cells, the sodium-potassium pump uses energy supplied by ATP to transport sodium ions out of the cell and potassium ions into the cell
  • Slide 9
  • Endocytosis Click for video of Endocytosis and Exocytosis Click for video of Endocytosis and Exocytosis During endocytosis, substances are moved into a cell by a vesicle that pinches off from the cell membrane
  • Slide 10
  • Exocytosis During exocytosis substances inside a vesicle are released from a cell as the vesicle fuses with the cell membrane
  • Slide 11
  • Communications between Cells Communication between cells often involves signal molecules that are bound by receptor proteins