Can I Carry That

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Can I Carry That???
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The cell membrane is responsible for maintaining
the cells homeostasis because it lets certain
materials into the cell and releases unwanted
materials.
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Cells transport these materials in two ways

• Active Transport
• Passive Transport

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There are 3 types of Passive Transport (USES NO
ENERGY!)

• Diffusion
• Osmosis
• Facilitated Diffusion

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Diffusion The movement of particles from a high
concentration area to a low concentration area.
Equal Concentration on Both Sides Equilibrium
Random Movement of Particles!!!
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OSMOSIS The passing of water molecules (into
and out of a cell) from a place of higher
concentration to a place of lower concentration.
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There are 3 different solutions in which osmosis
can occur

• FYI!!!
• Concentration Gradient The difference in
  concentrations of solutions

• Hypotonic
• Hypertonic
• Isotonic

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HYPERTONIC SOLUTIONS

• The water concentration inside the cell is
  greater than the water concentration outside the
  cell Causes shrinkage.

Think The outside is thirsty because there is
little water there, so it drinks the water from
the cell.
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HYPOTONIC SOLUTIONS

• The water concentration outside the cell is
  greater than that inside the cell.

Think The cell is thirsty, so it drinks the
water from outside the cell making it swell like
a hippo and possibly burst.
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ISOTONIC SOLUTIONS

• IsoSAME
• The concentration inside the cell is the same as
  the concentration outside the cell.
• Causes no change in the cell.

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Facilitated Diffusion

• Molecules use the transport proteins to pass
  through the cell membrane ONLY when the
  concentration inside and outside the cell is
  different.
• NO ENERGY IS USED!!!

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ACTIVE TRANSPORT

• Movement of materials against the concentration
  gradient.
• This requires energy!

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Endocytosis

• Large materials are taken into the cell
• The membrane engulfs the material and takes the
  material inside the cell in a pocket.
• The pocket forms a vacuole in cytoplasm.

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EXOCYTOSIS

• The release of substances inside of a cell where
  vacuoles form around the unwanted material. The
  vacuole fuses to the cell membrane and forces its
  contents out.