Active Transport

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Active Transport
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Review!

• Passive Transport
• From high to low concenration
• Does not require energy from the cell
• Diffusion
• Osmosis
• Facilitated diffusion

• Active Transport
• From low to high concentration
• Requires energy from the cell
• Active transport proteins
• Endocytosis
• Exocytosis

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Active transport

• is an energy-requiring process that moves
  material across a cell membrane.
• The cell uses active transport in three
  situations
• 1. When a particle is going from low to high
  concentration
• 2. When particles need help entering the
  membrane because they cant cross the
  membrane (it is impermeable to the molecule.)
• 3. When very large particles need to enter or
  exit the cell

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Active Transport Proteins

• Use chemical energy from the cell to change their
  shape and allow substances to pass through the
  membrane

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ENDOCYTOSIS

• Cells surround and takes in material from the
  environment forming a vesicle or vacuole.
• Includes pinocytosis and phagocytosis

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Pinocytosis

• Water and dissolved substances are taken up by
  the cell
• cell drinking

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Phagocytosis

• Up take of large particles by cells

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EXOCYTOSIS

• Vesicles fuse with the plasma membrane and
  release material on the outside of a cell.

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Vesicle fusing with cell membrane