2026-04-21 08:06

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3.7 Respiratory Parts

Upper Respiratory Tract

Lower Respiratory Tract

Explanation

• Three lobes of Right Lung
  • Superior (Top)
  • Middle (Middle)
  • Inferior (Lower)
• Same with the 2 lobes of the left lung
  • 2 lobes exist because of the heart being left sided
• Trachea
  • The windpipe, where oxygen and carbon dioxide flow through towards the upper respiratory tract
• Epiglottic Cartilage
  • Covers the epiglottis in cartilage
• Tracheal Cartilage
  • Covers the trachea in cartilage

Bronchial Tree

Explanation

• Pulmonary Artery Branch
  • Carries deoxygenated blood from the heart
• Pulmonary Vein Branch
  • Carries oxygenated blood to the heart
• Alveolar Ducts and Saccules
  • Single-celled width clusters of Alveolar cells.
  • Are covered in Capillaries.
  • They secrete Surfactant
• Capillary Network
  • A network of capillaries that conduct gas exchange, to ensure that deoxygenated blood becomes oxygenated before they return to the heart.
• Elastic Fibers
  • Help Alveoli stretch in inhalation and move back during exhalation which helps facilitate gas exchange.

References