7.3- Cell Transport Flashcards
Diffusion
process by which particles move from areas of high concentration to an area of low concentration
Facilitated Diffusion
process by which molecules cannot directly cross the membrane but can pass through special protein channels
Aquaporin
water channel proteins in the membrane which allow water to pass right through
Osmosis
the diffusion of water through a selective permeable membrane
Isotonic
“same strength” - concentrations of two liquids are equal
Hypertonic
“above strength” - the concentration that is higher than the other
Hypotonic
“below strength” - the concentration that is lower than the other
Osmotic Pressure
a force that will create the net movement of water out of or into a cell driven by differences in solute concentration
what is passive transport?
the movement of materials across a cell membrane without using cellular energy
What is active transport?
the movement of materials against a concentration difference that requires the use of cellular energy
endocytosis
“cell drinking”- process by which material is taken into the cell by means of infolding/pocketing of the cell membrane
exocytosis
release of large amount of material outside of the cell by fusing with either vacuole or vessicle and actively dumping out contents