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Cell Transport - PowerPoint PPT Presentation


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Cell Transport. How molecules move in and out of a cell. Passive & Active Transport. Passive Transport – requires no energy Moves molecules from high to low concentration Active Transport – requires energy Moves molecules from low to high concentration. Passive Transport.

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cell transport

Cell Transport

How molecules move in and out of a cell

passive active transport
Passive & Active Transport
  • Passive Transport – requires no energy

Moves molecules from high to low concentration

  • Active Transport – requires energy

Moves molecules from low to high concentration

passive transport
Passive Transport
  • http://programs.northlandcollege.edu/biology/biology1111/animations/passive1.swf
passive transport 3 types
Passive Transport - 3 types
  • Simple Diffusion – molecules going from high to low concentration across a membrane
  • Facilitated Diffusion – molecules going from high to low concentration through a protein

3. Osmosis – diffusion of water

active transport
Active Transport

http://www.yellowtang.org/animations/endocytosis_exocytosis.swf

passive vs active transport
Active Transport

Requires Energy

Go from Low to High Concentration

Use Proteins

Passive Transport

No Energy

Go from High to Low Concentration

May or may not use proteins

Passive Vs. Active Transport
the effects of osmosis on cells
The effects of osmosis on cells

Hypotonic

Isotonic

Hypertonic

Different solutions have different impacts on cells…

hypertonic hypotonic isotonic
Hypertonic, Hypotonic, Isotonic

Water always tries to balance itself out..so….

Hyper – high (more) Hypo – low (less)

  • Hypertonic – more water inside the cell

Result – water flows out of cell

2. Hypotonic - less water inside the cell

Result– water flows into the cell

  • Isotonic – equal water inside/outside the cell

Result– water levels stay the same

hypertonic hypotonic isotonic1
Hypertonic, Hypotonic, Isotonic?
  • What is it?
  • What direction

will the water move?

  • What will happen

to the cell size?

Salt water

hypertonic hypotonic isotonic2
Hypertonic, Hypotonic, Isotonic?
  • What is it?
  • What direction

will the water move?

  • What will happen

to the cell size?

Pure water

Salt water

hypertonic hypotonic isotonic3
Hypertonic, Hypotonic, Isotonic?
  • What is it?
  • What direction

will the water move?

  • What will happen

to the cell size?

Pure water

Pure water

think about this
Think about this…….
  • You have two identical pitchers side by side
    • one filled with exactly 2 quarts of water
    • the other filled with 2 quarts of Kool-aid
  • Which has more water in it?
  • WHY???