The Lungs

• Lungs


  Organ that allows you to get oxygen into your bloodstream and remove carbon dioxide from your blood
• Breathing


  1. Breathe air in

  2. Breathe air out
• Thorax


  • Top part of the body
  • Separated from lower body by diaphragm
• Lungs


  • Big pink sponges
  • Protected by ribcage
  • Surrounded by pleural membranes
• Air flow through lungs

  1. Air goes through trachea

  2. Trachea splits into two bronchi

  3. Bronchi split into smaller bronchioles

  4. Bronchioles end at alveoli
• Alveoli


  • Small air sacs where gas exchange takes place
  • Surrounded by blood capillaries
• Gas exchange in alveoli

  1. Oxygen diffuses from alveoli into blood

  2. Carbon dioxide diffuses from blood into alveoli
• Oxygen and carbon dioxide transport

  1. Oxygen released from red blood cells into body cells

  2. Carbon dioxide diffuses from body cells into blood
• Breathing rate


  Number of breaths per minute
• Breathing rate calculation


  • Bea takes 91 breaths in 7 minutes
• Breathing rate = number of breaths / number of minutes