Principles of Organisation (AQA GCSE Biology: Combined Science)

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Organisation: Principles

levels-of-organisation-igcse-and-gcse-biology-revision-notes

Multicellular organisms have many levels of organisation

  • Cells are the basic building blocks of all living organisms
  • Unicellular organisms are made from one cell, whereas multicellular organisms are made up of collections of cells
  • In complex multicellular organisms, cells are specialised to carry out particular functions. These specialised cells form tissues, which form organs in organ systems
  • In humans, the digestive system (provides the body with nutrients) and the respiratory system (provides the body with oxygen and removes carbon dioxide) are examples of organ systems that provide dissolved materials that need to be moved quickly around the body in the blood by the circulatory system

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Stewart

Author: Stewart

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Stewart has been an enthusiastic GCSE, IGCSE, A Level and IB teacher for more than 30 years in the UK as well as overseas, and has also been an examiner for IB and A Level. As a long-standing Head of Science, Stewart brings a wealth of experience to creating Exam Questions and revision materials for Save My Exams. Stewart specialises in Chemistry, but has also taught Physics and Environmental Systems and Societies.