Do Now

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Do Now

• One curve represents the diffusion of glucose
  through the lipid bilayer, and the other
  represents the transport of glucose by
  facilitated diffusion. Which curve corresponds
  to facilitated diffusion? Explain your
  reasoning.

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Endocytosis

• Endo- means in.
• cyto- means cell.
• osis means process of.
• What does endocytosis mean?
• Endocytosis the process by which cells take in
  large amounts of material, by folding in the cell
  membrane

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Endocytosis Example

• Pinocytosis non-specific endocytosis of small
  amounts of extracellular fluid.
• Greek pino- drinking

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Endocytosis Example

• Phagocytosis
• the endocytosis of solid particles such as
  bacteria, cell debris, or other solids
• Greek phago- eating

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Phagocytes

• Phagocytes, such as some types of white blood
  cells, engulf foreign cells by phagocytosis.

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For Protists, Phagocytosis Eating
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Exocytosis

• Exocytosis is the same process as endocytosis,
  except in reverse.
• The stuff leaving may be
• Proteins released into the ECF
• New lipids for expanding the membrane
• Membrane proteins
• Chemicals for communication, etc. (e.g. dopamine)

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Exocytosis
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Endo and Exocytosis quick review
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The Sodium / Potassium Pump

• The Na/K pump is responsible for maintaining
  the electrical charge of a cell
• Cells are negative
• Communication, e.g. neurons
• Cation uptake
• It is an example of a membrane pump which move
  specific things into or out of the cell AGAINST
  THEIR CONCENTRATION GRADIENT.
• Since it requires energy, it is an example of
  ACTIVE TRANSPORT!

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How the Na/K Pump Works

• Dont forget the animation.

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Recap Active Transport Uses ATP

• Endocytosis cell taking in material by
  infolding the membrane.
• Pinocytosis cell drinking ECF
• Phagocytosis cell eating bacteria, etc.
• Exocytosis cell exporting materials in bulk.
• Na/K Pump an example of a membrane pump that
  moves sodium ions out and potassium ions in
  AGAINST the concentration gradient. Causes cells
  to be negatively charged.