Movement through Membranes

• Diffusion: movement of molecules from areas of high concentration to areas of lower concentration
• Osmosis: the movement of water from an area of high concentration of water to an area of low concentration across a semi-permeable membrane
• Osmoregulation: the control of water and salt levels in the cell or the organism
• Turgor pressure: the force of the cell contents against the cell wall in plants
• Turgid cell: plant cell in which the contents of the cell are pushimh against the cell wall due to turgor pressure
• Plasmolysis: the loss of turgor pressure in a plant due to loss of water from the cytoplasm
• Active transport: The movement of molecules from an area of low concentration to an area of high concentration against a concentration gradient, using energy