• Concerned with breathing (inhalation & exhalation)
  • Four processes-
  • Ventilation
  • Gaseous exchange b/w air in lungs and blood
  • Transport of Oxygen and CO2
  • Utilization of O2 and production of CO2 by cells


  • Anatomically –
  • Upper respiratory tract
  • Lower respiratory tract


Upper conducting portion-

  • Nasal cavities
  • Pharynx
  • Larynx
  • Trachea
  • Bronchi
  • Bronchioles
  • Terminal bronchioles

Function– provide a passage for air to travel and condition the inspired air

Respiratory portion-

  • Respiratory bronchioles
  • Alveolar ducts
  • Alveolar sacs
  • Alveoli

Function- exchange of gases b/w air and blood

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