Lungs

• How the lungs work

  1. Air enters through the nose/mouth

  2. Passes through the trachea

  3. Enters the bronchi

  4. Splits into bronchioles

  5. Ends at the alveoli
• Blood flow through the alveoli

  Allows oxygen to be absorbed and carbon dioxide to be expelled
• You can calculate the breathing rate by counting the number of breaths taken in a given time period
• Alveoli are adapted to maximise the efficiency of gas exchange
• The lungs


  The lungs are in the thorax
• The thorax

  • The top part of your body
  • Separated from the lower part by the diaphragm
• Lungs

  • Protected by rib cage
  • Surrounded by pleural membranes
• Air breathed in


  1. Splits into 7 tubes

  2. Goes through trachea

  3. Called bronchi

  4. Each bronchus goes to each lung

  5. Bronchi split into smaller tubes called bronchioles

  6. Bronchioles end at alveoli
• Alveoli

  Where gas exchange happens
• Calculating breathing rate

  Breaths per minute = number of breaths / number of minutes