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9 Cards in this Set

  • Front
  • Back

homeostasis

dynamic equillibrium between independent elements

function of cell membrane

allows selected substances to move through


keeps important stuff in, bad stuff out


site of biochemical reaction


mechanical support

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

diffusion

passive movement of particles from a region of high concentration to place of low concentration

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





what is active transport

active transport requires energy and transport proteins

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

example of diffusion

perfume diffuses into air


tea bag


food colouring

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