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Movement in and out of the cell (Key words (to spread, permeable, to get…
Movement in and out of the cell
DIFFUSION
free,random, even movement of molecules in liquids and gases ( fluid)
spread from a high concentration reagion to a low concentration region
movement down a concentration gradient
thanks to it , living things obtain many of their requirements and get rid of waste
OSMOSIS
diffusion through a semipermeable membrane
it takes place in case of two solutions,separated by a partially permeable membrane and having different concentration
the water molecules can pass through the membrane and
their movement is down the water potential
where the concentration of the solute is higher the water potential il lower
ACTIVE TRANSPORT
Energy consuming process
the transport takes place against the concentration gradient
transported substances go through the protein situated in the cell membrane
big molecule, ions and polar molecules require active transport.
protein molecules in the celle mebrane change their shape because of the transport, this process requires energy
Key words
to spread
permeable
to get rid of waste
solute
solvent
solution
concentration
water potential
diffusion
gradient
osmosis
dilute solution
to swell
to shrink
to shrivel