the respiratory system and ventillation

• what are the lungs?

  • you breathe in air which goes through trachea
  • divides into two bronchi - further splits into bronchioles
  • bronchioles end at small bags = alveoli
  • thorax is at top part of your body
  • separated from lower part of body by diaphragm
  • lungs surrounded by pleural membranes and lungs protected by ribcage of intercostal muscles run between the ribs
• what happens when you breathe in with intercoastal and diaphragm

  • intercostal muscles and diaphragm contract
  • thorax increases in volume
  • decrease in pressure drawing air in
• what happens when you breathe out with intercoastal and diaphragm

  • intercostal muscles and diaphragm contract
  • thorax volume decreases
  • air forced out