4.2.1 principles of organisation

• What are cells?

  The basic building blocks of all living organisms
• what is a tissue?

  a group of cells with a similar structure and function
• what are organs?

  a collection of tissues performing specific functions
• what are organ systems?

  groups of organs that work together to form organisms
• what are examples of organ systems?

  the digestive system, the circulatory system and the gas exchange system