Osmosis (AQA GCSE Biology): Flashcards
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12 cards from this deck
What type of diffusion is osmosis?
What type of diffusion is osmosis?
Special type involving only water
What direction does water move in osmosis?
What direction does water move in osmosis?
From weak/dilute to strong/concentrated solution
What is a dilute solution?
What is a dilute solution?
Lots of water, not much dissolved stuff
What is a concentrated solution?
What is a concentrated solution?
Less water, lots of dissolved stuff
What partially permeable membranes allow through
What partially permeable membranes allow through
Small molecules like water
What partially permeable membranes block
What partially permeable membranes block
Larger molecules like sugar
Key property of cell membranes for osmosis
Key property of cell membranes for osmosis
Partially permeable
Red blood cells in conc. sugar - water movement
Red blood cells in conc. sugar - water movement
Water moves out of cells
Red blood cells in conc. sugar - cell effect
Red blood cells in conc. sugar - cell effect
Cells shrink
Red blood cells in pure water - water movement
Red blood cells in pure water - water movement
Water moves into cells
Red blood cells in pure water - cell effect
Red blood cells in pure water - cell effect
Cells swell up and may burst
What substance moves in osmosis?
What substance moves in osmosis?
Only water