Eukaryotic Cell Organisation (AQA AS Biology): Revision Note

The organisation of cells

• In multicellular organisms, eukaryotic cells become specialised to carry out specific functions, e.g.:

  • epithelial cells in the small intestine absorb nutrients

  • red blood cells transport oxygen

• Specialised cells of the same type form a tissue; a group of similar cells working together, e.g.:

  • epithelial tissue absorbs food in the small intestine

  • muscle tissue contracts to produce movement

• Tissues combine to form an organ

  • E.g. the heart contains muscle, connective and vascular tissues

• Organs work together as part of an organ system

  • E.g. the heart is part of the circulatory system