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• similar cells are organised into tissues
• muscular tissue, contracts to move whatever its attached to
• glandular tissue makes and secretes chemicals
• epithelial tissue is a type of tissue that covers the outside of the body and lines the inside of the body
• organs are made up of tissues
• organ systems are made up of organs
• a catalysis is a substance which increases the speed of a reaction, without being changed or used up in the reaction
• enzymes are biological catalysts
• if the temperature is too hot the enzyme will be denatured
• when an enzyme is denatured, the active site changes shape and the substrate cannot fit