Transporting Substances

• Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration.
• Osmosis is the net movement of water molecules across a semi-permeable membrane from a higher water concentration to a lower water concentration.
• Active transport is the movement of particles across a membrane againts a concentration gradient using energy transferred from respiration. From an area of low concrntration to an area of high concentration.
• Percentage Change = Final Mass - Initial Mass / Initial Mass X 100