Respiratory system205Respiratory system2061234679101113 23222120191716151418 512 8LSIRFig 98 The structures associated with the respiratory systemRespiratory system207CommentsAnatomical: The organs of the respiratory system include the nose, the pharynx, the larynx, the trachea, the bronchi, the bronchioles, the two lungs and\ their pleural coverings, the intercostal muscles and the diaphragm.Physiological: The chemical activity of the cells of the body needs energy and oxygen (O2) and releases carbon dioxide (CO2). The respiratory system consists of the structures that ensure the supply of atmospheric O2 and the excretion of CO2.Clinical: The colour of the skin and of the nails provides information about the \respiratory system. The skin and the nails are normally pink. Cyanosis c\an occur in cases of respiratory failure or airway obstruction, for example.1. Pharynx2. Epiglottis3. Larynx4. Trachea5. Apex6. Left main bronchus7. Ribs8. Diaphragm9. Base of left lung10. Aorta11. Vertebral column12. Cardiac cavity13. Inferior vena cava14. Pleural cavity15. Visceral pleura16. Parietal pleura17. Right lung18. Apex19. Right clavicle20. Cricoid cartilage21. Thyroid cartilage22. Hyoid bone23. Nose20810123456 7 8 9 PSIAFig 99 The constituent structures of the nasal septumRespiratory system209CommentsAnatomical: The nasal septum consists, posteriorly, of the perpendicular plate of the ethmoid bone and of the vomer, anteriorly, of the septal cartilage, \superiorly, of the cribriform