Cellular Transport: Part Two

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Cellular TransportPart Two

• Getting In and Out of Cells
• With Effort!!

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Review Passive Transport

• Passive Transport does NOT use energy.

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Three Types of Passive Transport

• Diffusion the movement of molecules from an area
  of high concentration to an area of low
  concentration
• Osmosis the diffusion of water across a
  selectively permeable membrane
• Facilitated diffusion diffusion with the help of
  a transport protein (gate)

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Active Transport

• Active Transport
• Requires ENERGY
• substances move from areas of low concentration
  (few molecules) to areas where the concentration
  is already high (lots of molecules)

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Source of energy

• Chemical energy stored in the molecule ATP
• ATP?ADP Phosphate energy

YOU NEED THIS ATP
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Energy

• Most of the ATP for cell transport is made in the
  mitochondria

http//www.youtube.com/watch?vqotIWgL7zFsfeature
related
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Example

• Trying to walk against the crowd
• Sodium ions are pumped out of cell
• Potassium ions are pumped in

http//www.youtube.com/watch?vkfy92hdaAH0
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Endocytosis (enter the cell)

• Endocytosis Cell membrane surrounds particle and
  then pinches off inside the cell
• Forms a vesicle storage box
• http//www.youtube.com/watch?v1w10R9lv7eQfeature
  related
• http//highered.mcgraw-hill.com/sites/0072437316/
  student_view0/chapter6/animations.html

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Examples

• One-celled organisms (amoeba) eat this way
• White blood cells eat bacteria

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Exocytosis (exit the cell)

• Exocytosis Vesicles inside the cell move to the
  cell membrane and merge. Contents of vesicle are
  released outside the cell.

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Examples

• Hormones are released into the blood
• Digestive chemicals are released into your stomach

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And now you know

• Getting things in and getting things out
• Thats what Cellular Transport is all about
• And Now..
• One more look at my favorite
• ENDOCYTOSIS
• http//www.cellsalive.com/mac.htm