diffusion and facilitated diffusion

which types of transport are passive?

diffusion, facilitated diffusion, osmosis

diffusion definition

net movement of molecules or ions from an area where they are more highly concentrated to an area where the concentration is lower until evenly distributed

which types of molecule can be transported by diffusion?

small, non-polar molecules

which way are the molecules transported across the concentration gradient in diffusion?

down

is diffusion active or passive transport?

passive

where does the energy for diffusion come from?

the kinetic energy of the molecules

facilitated diffusion definition

net movement of molecules or ions from an area where they are more highly concentrated to an area where the concentration is lower until evenly distributed with the help of channel and carrier proteins

does facilitated diffusion require energy from ATP?

no

where does the energy come from in facilitated diffusion?

the kinetic energy of the molecules

what type of molecules get transported in facilitated diffusion?

large polar molecules, charged particles (ions)

how does facilitated diffusion differ from simple diffusion?

protein channels and carrier proteins are used

how do channel proteins work?

the water-soluble ions are detected by the protein, causing it to open. the ion diffuses into the cell and the protein closes

how do carrier proteins work?

ion binds to the protein, causing it to change shape and release the ion inside the cell