The Respiratory System and Gas Exchange

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The Lungs

  • The Lungs are protected by the rib-cage and surrounded by the pleural membrane.
  • The air you breath goes through the trachea. This splits into 2 tubes called bronchi going into each lung.
  • Then the bronchi split into smaller tubes called the bronchioles.
  • Finally the bronchioles finally end with small air sacs called alveoli where gas exchange takes place.

Breathing In

  • Intercostal muscles and diaphragms contract
  • Thorax volume increases

Breathing Out

  • Intercostal muscles and diaphragms relax
  • Thorax volume decreases

The Effect of…


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