structure of respiratory system

• larynx

  connects back of nose and trachea, forming air passage to lungs
• trachea


  also known as the windpipe, starts at the back of throat (pharynx) and divides into two bronchi
• bronchi and bronchioles

  each lung has a bronchi that continues to divide into smaller bronchioles
• trachea and bronchi are tubes that have rings of cartilage along their length to stop them collapsing so that open passage for air is maintained
• the rings are 'c-shaped' in trachea with the gap at back to allow food to travel down oesophagus, it needs to stretch as food passes down
• alveoli (single alveolus)


  at end of bronchioles are alveoli, sacs found in clusters at end or bronchioles
• alveolus

  each is surrounded by capillary network where oxygen and carbon dioxide are exchanged through the alveolar membrane, 300 million in lungs
• diaphragm 


  muscle anchored to lower ribs that separates chest from abdomen
• intercostal muscles


  muscles found between the ribs
• pleural membrane


  cover outside of lungs and line inside of chest wall
• what is 1?

  nose

  
• label each part of the respiratory system

  A) nose

  B) bronchi

  C) alveoli

  D) bronchioles

  E) diaphragm

  F) bronchi

  G) trachea

  H) larynx