Transport Across Cell membranes

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What is diffusion?
The passive movement of particles
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What effects the rate of diffusion?
The concentration gradient, The thickness of the exchange surface, The surface area, the temperature
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What is facilitated diffusion?
When larger molecules like amino acids, glucose, ions don't diffuse through phospholipid bilayer, so they diffuse through channel or carrier proteins
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What is active transport?
Uses energy to move molecules and ions across plasma membranes against a concentration gradient.
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What is endocytosis and exocytosis?
Cells take in substances/Cells secrete substances
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Describe the process of endocytosis
A cell surrounds a substance with a section of plasma membrane, this then pinches off to form a vesicle inside the cell containing the ingested substance
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Describe the process of exocytosis
Vesicles containing substances pinch off from the sacs of the golgi and move towards the plasma membrane, vesicles fuse with plasma membrane and release contents outside the cell
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What is osmosis ?
Diffusion of water cells across a partially permeable membrane down a water potential gradient
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What experiment investigates water potential?
Potato cylinders
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Card 2

Front

What effects the rate of diffusion?

Back

The concentration gradient, The thickness of the exchange surface, The surface area, the temperature

Card 3

Front

What is facilitated diffusion?

Back

Preview of the front of card 3

Card 4

Front

What is active transport?

Back

Preview of the front of card 4

Card 5

Front

What is endocytosis and exocytosis?

Back

Preview of the front of card 5
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