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9 Cards in this Set
- Front
- Back
homeostasis |
dynamic equillibrium between independent elements |
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function of cell membrane |
allows selected substances to move through keeps important stuff in, bad stuff out site of biochemical reaction mechanical support |
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osmosis |
passive movement of water molecules across a semi permeable membrane from a region of low solute concentration to a region of high solute concentration |
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diffusion |
passive movement of particles from a region of high concentration to place of low concentration |
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compare and contrast osmosis and diffusion |
diffusion is high to low concentration gradient, osmosis is low solute concentrate to high solute concentrate diffusion does not require water, osmosis does |
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what is active transport |
active transport requires energy and transport proteins |
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what is facilitated diffusion |
Large molecules and ions might be unable to pass through membrane because of the tails of the phospholipid layer. Proteins can faciiliate movement through membrane. this happens through carrier protein channels |
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example of diffusion |
perfume diffuses into air tea bag food colouring |
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example of osmosis |
Dehydrated food becomes hydrated when submersed in water Fingers prune when been in water too long because the water outside the body is higher solute than insidee |