Principles of Organisation (AQA GCSE Biology): Revision Note
Exam code: 8461
Organisation: Principles
Levels of organisation in an organism
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
Levels of organisation
Level | Description |
|---|---|
Cells | Basic functional and structural units in a living organism |
Tissues | A group of cells of similar structure working together to perform a particular function |
Organs | Made from a group of different tissues working together to perform a particular function |
Organ systems | Made from a group of organs with related functions, working together to perform body functions within the organism |
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