Movement of substances

Name: __________________ Topic: Movement of substances Concepts Summary Notes Nan Hua High School Biology 1 LO: Define diffusion and describe its role in nutrient uptake and gaseous exchange in plants and humans Definition: Diffusion is the net movement of particles from a region of higher solute concentration to a region of lower solute concentration. Role of diffusion in nutrient uptake and gaseous exchange: Humans: ● Digestion: Absorption of glucose, amino acids, fatty acids and glycerol in small intestines ● Respiration: o Exchange of gases between alveoli and blood o Exchange of gases between blood capillaries, tissue fluid and body cells

Name: __________________ Topic: Movement of substances Concepts Summary Notes Nan Hua High School Biology 2 Plants: ● Photosynthesis: Exchange of gases between leaves and environment through stomata ● Transport in plants: Absorption of mineral salts/ ions by root hair cells Characteristics of diffusion:  passive process, does not require energy  can take place with or without a membrane  involves any type of molecules  down a concentration gradient

Name: __________________ Topic: Movement of substances Concepts Summary Notes Nan Hua High School Biology 3 LO: Define osmosis and describe the effects of osmosis on plant and animal tissues Definition: Osmosis is the net movement of water molecules from a region of higher water potential to a region of lower water potential down a water potential gradient through a partially permeable membrane. Effects of osmosis: ● Intake of water by cells ● Transport in plants: Absorption of water from surroundings by root hair cells Characteristics of osmosis:  passive process, does not require energy  requires a partially permeable membrane  involves water molecules only  down a water potential gradient LO: Define active transport and discuss its importance as an energy - consuming process by which substances are transported against a concentration gradient, as in ion uptake by root hairs and uptake of glucose by cells in the villi Definition: Active transport is the movement of particles from a region of lower solute concentration to a region of higher solute concentration against a concentration gradient. Energy is required for this process.

Name: __________________ Topic: Movement of substances Concepts Summary Notes Nan Hua High School Biology