3.7 Respiratory Parts
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.