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Diffusion and Osmosis
process by which molecules spread from an area of greater concentration to less concentration
differences in concentration of a substance across space
state that exists when concentration of a substance is the same throughout space
when is an object permeable to a membrane?
if the substance can move across it
can all molecules diffuse across a membrane?
no depends on size and shape
process by which molecules spread from an area of greater concentration to less concentration in water
substance that dissolves in solution
concentration of solute molecules outside cell is lower than concentration inside
concentration of solute molecules outside cell is higher than concentration inside
molecules diffuse in and out at equal rates
pressure that h2o molecules exert against cell wall
when cells shrink away from cell walls-turgor pressure is lost
bursting of cells
process by which cells ingest cyternal fluid and large particles
transport of fluids
movement of large particles
Cells must move materials up their concentration gradient
Carrier proteins transport Na+ ions and Kt ions up their concentration gradient
binds to the molecules it transports.
molecules that cannot diffuse rapidly through cell membranes even when there is a concentration gradient-molecules are assisted by carrier proteins
amount of energy used in certain period
substance that dissolves another to make a solution
Does temperature effect diffusion?
Yes, warmer it is the faster diffusion takes place
a pliable tissue which allows some materials to pass but stops others
describes how rigid plant cells are due to pressure of water they contain
two substances in physical contact with each other exchange no heat
constant action but the result in the action has no change
Basil Metabolic Rate
process by which material is exported from a cell
various compounds composed of fatty acids and phosphoric acid and a nitrogenous base
passageways through cell membrane
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