Transport Across Cell Membranes Flashcards
(10 cards)
what molecules move into the cell membrane
glucose, oxygen, amino acids
what waste molecules move out the cell membrane
carbon dioxide, urea
what is diffusion
the movement off molecules from an area of high concentration to an area of low concentration . it is a passive process and does not require energy
what is osmosis
the movement of water molecules from an area of high water conc to an area of low water conc across a selectively permeable membrane. it is a passive process and does not require energy
what is active transport
the movement of molecules or ions from an area of low concentration to an area of high concentration against a concentration gradient. this uses membrane proteins. it is an active process and does require energy
what is proteins in the cell membrane
responsible for moving molecules through active transport.
what happens to an animal cell when placed in a high water concentration
the cell BURSTS
what happens to an animal cell when placed in a low water concentration
the cell SHRINKS
what happens to a plant cell when placed in a high water concentration
the cell becomes TURGID
what happens to a plant cell when placed in a low water concentration
the cell becomes Plasmolysed
