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Air, Respiratory system and Circulatory system (Respiratory system (Human…

- - - - pumps blood to all parts of the body
    - - tubes which carries blood around the body
    - - transport oxygen, digested food, nutrients and water to all parts of the body
      - transport waste material away from the body
      - transport carbon dioxide to the lungs
- - - - It has tiny hairs which helps to trap dirt in the air and hence clean the air before it enters the lungs
      - It warms and moistens the air we breathe in
    - - contains fine hair that traps dirt in the air we breathe
    - - allow gaseous exchange to take place
      - absorbs oxygen from inhaled air
      - release carbon dioxide and water vapour into exhaled air
- - - - It takes up about 21% of the air in the atmosphere
      - It is needed by all living things during respiration
      - It is needed for burning to take place
    - - It takes up about 0.04% of air in the atmosphere
      - It is used in fire extinguishers
      - It is taken in by plants during photosynthesis
    - - It takes up about 78% of the air in the atmosphere
      - It is used by some bacteria in the soil and to make nutrients that are then used by the plants
    - - It takes up about 0.96% air in the atmosphere
      - water vapour is the gaseous state of water droplets
      - examples of rare gases:
        
        argon
        
        neon
        
        xenon
        
        helium