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Movement of molecules from an area where there are many to an area where there are few
Selectively Permeable Membrane- [like a strainer] - contains different size openings called pores
- only materials smaller than openings pass through
Diffusion- Movement of molecules from an area where there are many to an area where there are few
Examples: food coloring in water, spraying air freshener
Simple Rule:
Equilibrium/Homeostasis- molecules are equally distributed in an area
CONTINUES UNTIL …….
Osmosis- movement of WATER molecules from an area where there are many to an area where there are few
Plasmolysis- cell membrane shrinking away from cell wall, due to water exiting cell Why?
Salt is a substance that will draw water in its direction. This is why you feel thirsty when you eat something salty.
Simple Rule:
Salt WaterFresh Water Cell Membrane
Plant CellsPlant Cells
100% H2O
97% H2O
90% H2O
97% H2O
Water rushes into cell, keeps cellrigid
Water moves out of cell,Cell membrane pulls away from cell wall
10% NaCl
PLASMOLYSIS
HYPOTONIC CELL HYPERTONIC CELL
HYPO = lessTONIC = solution
HYPER= moreTONIC = solution
100% H2O
90% H2O
95% H2O
100% H2O
- Water rushes into cell- Cell swells and may burst due to lack of cell wall
- Water rushes out of cell-Cell shrinks due to lack of cell wall
HYPOTONIC CELL HYPERTONIC CELL
97% H2O
97% H2O
- Cell does not change, water equal inside and out
Equilibrium/Homeostasis
ISOTONIC CELL
ISO = sameTONIC = solution
Animal cells and water movementAnimal cells and water movement
Active Transport - requires energyEndocytosis- process used by cells to transport large materials [proteins] INTOINTO cell
Greek terms : ENDO = inside CYTOSIS = relates to cell
Exocytosis- process used by cell to move wastes or other materials OUTOUT of cell
Greek terms : EXO = outside CYTOSIS = relates to cell