Lung & Gas exchange

• Gas exchange

  Oxygen passes from the atmosphere to the bloodstream while carbon dioxide passes from the bloodstream to the atmosphere
• Tube that leads to the bronchi

  Trachea
• What leads to the bronchiole

  Bronchi
• What stems off the bronchiole

  Alveoli
• How have alveoli adapted to their role

  Walls are only one cell thick which provides a short distance for diffusion

  Many of them therefore have a large surface area

  Noise allowing the gases to dissolve therefore diffusing more easily

  Good blood supply and good air supply
• Process by which oxygen moves through the wall of the alveoli, into the blood

  Diffusion
• What happens to oxygen once it enters the bloodstream

  Diffuses into red blood cells and binds to haemoglobin
• Formula for counting breathing rate

  Number of breathes/time (minutes)