lungs and gas exchange

• air passage:

  • nose/mouth
  • trachea
  • bronchi
  • lungs
  • bronchioles
  • alveoli
• how are alveoli adapted to gaseous exchange:

  • large surface area
  • one cell thick walls
  • They are moist, which allows the gases to dissolve, and therefore diffuse more easily 
• the substance inside red blood cells does oxygen binds to is haemoglobin