transport across membranes Flashcards
whats the cell membrane composed of
phospholipids and proteins
passive transport
movement of from an area of high concentration to an area of low concentration DOWN a concentration gradient and does NOT require energy
Examples of passive transport
diffusion and osmosis
osmosis
movement of water molecules from an area of high concentration to an area of low concentration DOWN a concentration gradient and does NOT require energy
substances that move INTO the cell by diffusion
oxygen, glucose, amino acids
substance that leaves cell by diffusion
carbon dioxide
why is diffusion important
it helps provide the cell with raw materials and removes waste products
animal cell in HIGH water concentration
burst
animal cell in solution than lower concentration than that inside the cell
shrink
plant cell placed in high water concentration
turgid
plant cell that is placed in a lower concentration of water of that in the cell
plasmolysed
active transport
the movement of molecules AGAINST a concentration gradient from and area of low concentration to an area of high concentration requires energy
active transport requires
energy from ATP to allow membrane proteins to mov
