Cellular Movement

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Cellular Movement

• Passive and Active Transport

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Passive Transport

• Does NOT require ENERGY to move particles into or
  out of a cell
• Movement of particles from HIGHER concentration
  to LOWER concentration
• DIFFUSION movement of particles
• OSMOSIS movement of water

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DIFFUSION

• The process in which molecules move from areas of
  HIGH concentration to areas of LOW concentration

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DIFFUSION

• Example Smell of baking cookies from the oven
  moving through the house.

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OSMOSIS

• The diffusion of water molecules through a
  membrane

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OSMOSIS

• Movement of WATER from a HIGHER concentration to
  a LOWER concentration
• Example Plant taking in water during a rainy day.

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Lets Practice
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Lets Practice

• The concentration of oxygen particles inside a
  cell is 45 percent and outside the cell is 30
  percent. What will most likely happen?

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Lets Practice

• The concentration of water molecules inside a
  cell is 80 percent and outside the cell is 25
  percent. What will most likely happen?

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Lets Practice

• The concentration of hydrogen particles inside a
  cell is 33 percent and outside the cell is 62
  percent. What will most likely happen?

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Equilibrium

• In all cases, cells want EQUILIBRIUM!
• Too much (or too little) of a good thing is
  BAD for the cell!

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When do the molecules stop moving?

• EQUILIBRIUM molecules are evenly distributed

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Active Transport

• Requires ATP ENERGY to move particles into or out
  of cell
• Movement of particles from LOWER concentration to
  HIGHER concentration
• Endocytosis
• Exocytosis

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ENDOCYTOSIS

• Cell membrane encloses a vesicle filled with
  particles and absorbs it, BRINGING IT INTO the
  cell

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EXOCYTOSIS

• Cell membrane encloses a vesicle filled with
  particles and PUSHES IT OUT of the cell

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Active Transport Example

• A person trying to squeeze into an already
  crowded elevator!
• It takes ENERGY to do so!

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What happens to cells when put in salt water?

• This is why you do not want to drink salt water
  when you are lost at sea!

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Water moves out of the cell to try to reach
equilibrium. The cell dries out, shrinks, and
dies!
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