Respiratory system

• Lungs


  Organ that gets oxygen into your bloodstream and removes carbon dioxide from your blood
• The Lungs


  • Located in the thorax
  • Separated from the lower body by the diaphragm
  • Protected by the ribcage
  • Surrounded by pleural membranes
• Air flow through the lungs

  1. Breathe in through trachea

  2. Trachea splits into bronchi

  3. Bronchi split into bronchioles

  4. Bronchioles end at alveoli
• Alveoli


  Small air sacs in the lungs where gas exchange takes place
• Gas exchange in the 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
• Calculating breathing rate

  • Kerry takes 91 breaths in 7 minutes, her breathing rate is 13 breaths per minute
• Alveoli are well adapted for carrying out gas exchange