Humans

• what are lungs specialised organs for?

  gas exchange
• why do we need to get oxygen into the blood?

  for respiration
• why do humans need to get rid of carbon dioxide?


  ]
• what is carbon dioxide made by in humans?

  respiring cells
• what happens as you breathe in>?

  air enters the trachea
• what is another name for trachea?

  windpipe
• what does the trachea split into?

  two bronchi - one bronchus leading to each lung
• what does each bronchus branch of finto?

  smaller tubes called bronchioles
• what do the bronchioles end in?

  small 'air sacs' called alveoli
• where are gases exchanged?

  alveoli
• what move together to move air in and out?

  the ribcage, intercostal muscles and diaphragm
• what does ventilation consist of?

  inspiration and expiration
• what is inspiration?

  breathing in
• what is expiration?


  breathing out
• what is ventilation controlled by?

  the movements of the diaphragm, internal and external intercostal muscles and ribcage