2.1 describe the levels of organisation within organisms: organelles, cells, tissues, organs and systems

Levels of organisation within organisms, smallest to largest

  1. Organelles – Highly organises structure (or rather, part) of a molecule that performs a specific function within their cell. For example, mitochondria, which stores energy for the human body’s cells
  2. Cells – Functional unit made up of organelles, eg. skin cells
  3. Tissues – A collection of similar cells that all serve a common function, eg the glandular tissue which produces enzymes and hormones
  4. Organs – made up of several kinds of tissues that act together to function as a unit, for example the heart, kidneys…
  5. Organ systems – Several organs grouped together to form a function, eg. the Respiratory system composed of the heart and lungs.

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