organisation - the blood

• Levels of organisation in multicellular organisms


  • Cells
  • Tissues
  • Organs
  • Organ systems
• Organelle


  A specialised unit within a cell which performs a specific function
• Cell


  The basic building block of all living organisms
• Tissue


  A group of cells working together to perform a shared function, and often with similar structure
• Organ


  A structure made up of groups of different tissues, working together to perform specific functions
• Organ system


  A group of organs with related functions, working together to perform certain functions within the body
• The human respiratory system is a body system adapted for efficient gas exchange