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Introducing Cell Transport. Cell Transport. Concentration Gradient Concentration – The amount of solute in a solution Gradient – A measure of how much something changes when you move from one region to another. Put ‘em together and what do you get?

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cell transport
Cell Transport
  • Concentration Gradient
    • Concentration – The amount of solute in a solution
    • Gradient – A measure of how much something changes when you move from one region to another.
  • Put ‘em together and what do you get?
    • Concentration Gradient - measurement of how the concentration of something changes from one place to another.
passive transport
Passive Transport
  • Passive Transport – Molecules moving from an area of high concentration to low concentration.
    • No energy needed
diffusion
Diffusion
  • The process by which molecules spread from areas of high concentration, to areas of low concentration.
    • Equilibrium – Concentration is equal throughout solution.

Diffusion Animation

osmosis
Osmosis
  • The movement of water molecules from high concentration to low concentration
osmosis1
Osmosis
  • Hypertonic: Water diffuses out of cell
    • (Cell Shrinks)
  • Hypotonic: Water diffuses into cell
    • (Cell swells)
  • Isotonic: Equal rate of water diffusion into and out of the cell
    • (Cell Stays the Same)
  • http://staff.jccc.net/aalarabi/memb_related_mov.htm
facilitated diffusion
Facilitated Diffusion

A form of diffusion facilitated by transport Proteins also known as carrier proteins

facilitated diffusion1
Facilitated Diffusion
  • http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_facilitated_diffusion_works.html
active transport
Active Transport
  • Active Transport: The Transport of a substance across the cell membrane against its gradient
  • Requires Energy ( usually ATP)
  • http://staff.jccc.net/aalarabi/memb_related_mov.htm
bulk transport
Bulk Transport
  • Endocytosis- The movement of a substance into a cell by a vesicle
  • Cell membrane forms pouch around substance and then pinches off
bulk transport1
Bulk Transport
  • Exocytosis- The movement of substance by a vesicle to the outside of a cell
  • Vesicles fuse with cell membrane
cells must be small
Cells Must Be Small
  • All substances that enter or leave the cell must cross that cell’s surface
  • Small cells can exchange substances better than large cells
  • They don’t have to travel as far to reach the center