Breathing mechanisms

• Label the diagram of the respiratory system

  :

  A) N/A

  B) Mouth

  C) Alveoli

  D) Lung

  E) Diaphragm

  F) Trachea

  G) Bronchioles

  H) Bronchi

  
• The lungs are two sacs which allow oxygen from the atmosphere to be inhaled and carbon dioxide from the body to be exhaled
• The bronchi branch off the trachea and allow air to be transported from between the lungs and atmosphere
• The bronchioles connect the alveoli to the bronchi and allow air to pass through them
• The alveoli is the site of gas exchange with blood. This allows oxygen and carbon dioxide to be transported between the lungs and the muscles
• The diaphragm is a dome-shaped muscle under the ribs which contracts and relaxes to change the capacity of the thoracic cavity, and therefore causes inhalation and exhalation