3.2

• breathing - the process the respiratory system uses to move air in and out of your lungs
• function of respiratory system - supplying your blood with oxygen and removing the CO2 from your blood and returning it to the outside air
• inhaling - your diaphragm muscles contract, pulling ribs up and diaphragm down.

  • this increases the size of your chest and lungs
  • pulls air into lungs
• exhaling - diaphragm muscles relax, pulling diaphragm up and ribs down

  • forces air out
  • decreases chest size
• bronchi - two branches that connect to either lung. tube - like passages
• cells need oxygen to release energy from nutrients
• bronchi - bronchioles - alveoli
• alveoli - made of epithelial tissue ( same as capillaries )

  • the air in the alveoli has a high concentration of oxygen while the capillaries have less oxygen
  • oxygen diffuses into the blood, carbon diffuses out back into the lungs
• respiratory system

  A) bronchi

  B) bronchioles

  C) lung

  D) diaphragm

  E) trachea

  
• bronchitis -

  • Mucus builds up in bronchi and causes them to become narrower
• • Emphysema - Disease that causes damage to lung tissue, causing shortness of breath
• Lung Cancer - Tumor or cancerous growth forms in the lungs; takes up space and impairs lung functioning