cell organisation

• large multicellular organisms are made up of organ systems that work together to carry out a specific function
• the process by which cells become specilised is called differentiation
• differentiation occurs during the development of multicellular organisms. these specialised cells form tissues, which form organs, which form organ systems
• large multicellular organisms have different systems inside them for exchanging and transporting substances
• a tissue is a group of similar cells that work together to carry out a particular function e.g muscular tissue which contracts to move
• an organ is a group of tissues that work together to perform a specific function
• an organ system is a group of organs working together to perform a specific function