Cell Transport How molecules move in and out of a cell.

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Presentation transcript:

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 /biology1111/animations/passive1.swf /biology1111/animations/passive1.swf

Passive Transport - 3 types 1.Simple Diffusion – molecules going from high to low concentration across a membrane 2.Facilitated Diffusion – molecules going from high to low concentration through a protein 3. Osmosis – diffusion of water

Active Transport osis_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

Water water everywhere, but not a drop to drink!

The effects of osmosis on cells HypotonicIsotonicHypertonic Different solutions have different impacts on cells…

Hypertonic, Hypotonic, Isotonic Water always tries to balance itself out..so…. Hyper – high (more)Hypo – low (less) 1.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 3.Isotonic – equal water inside/outside the cell Result – water levels stay the same

Hypertonic, Hypotonic, Isotonic? What is it? What direction will the water move? What will happen to the cell size? Salt water

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, Isotonic? What is it? What direction will the water move? What will happen to the cell size? Pure water

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???