https://www.therespiratorysystem.com/alveoli/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2017/06/Alveoli.jpgLabeled diagram of alveoli showing a bronchiole, alveolar duct, alveolar sac, pores of Kohn, pulmonary arteriole, venule and capillarieshttps://www.therespiratorysystem.com/wp-content/uploads/2017/06/Labeled-Diagram-of-Alveoli-Gas-Exchange.jpgDiagram of gas exchange within an alveolus: oxygen diffuses into a capillary red blood cell while carbon dioxide diffuses into the air space https://www.therespiratorysystem.com/bronchi/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2017/05/Bronchi.jpgLabeled diagram of the bronchi showing the trachea, carina, right and left primary bronchi, lobar and segmental bronchi inside the lungshttps://www.therespiratorysystem.com/wp-content/uploads/2017/05/Bronchus-Anatomy-Diagram.jpgDiagram of a bronchus wall showing cartilage plates, smooth muscle, mucus lining, ciliated lining, blood vessels and the bronchial lumen https://www.therespiratorysystem.com/bronchioles/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2017/04/Bronchioles.jpgLabeled diagram of the bronchioles showing a lobular bronchiole, terminal and respiratory bronchioles, alveolar ducts, alveolar sacs and capillaries https://www.therespiratorysystem.com/diaphragm/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2017/09/Diaphragm.jpgDiaphragm seen from above with central tendon, crura, caval and esophageal openings, aorta, phrenic nerves and lumbar vertebrae labeledhttps://www.therespiratorysystem.com/wp-content/uploads/2017/09/Diaphragm-Muscle-Location-Picture.jpgFront view of the rib cage showing the diaphragm muscle with its right and left domes, central tendon, esophageal and aortic openingshttps://www.therespiratorysystem.com/wp-content/uploads/2017/09/Diaphragm-Function-in-Breathing.jpgSide-by-side diagram of inhalation and exhalation showing the diaphragm flattening and relaxing as the chest and lungs expand and shrink https://www.therespiratorysystem.com/epiglottis/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2016/12/Epiglottis.jpgSide view of the head and neck showing the epiglottis behind the tongue, above the larynx, with the trachea and esophagus belowhttps://www.therespiratorysystem.com/wp-content/uploads/2016/12/Epiglottis-Anatomy-Diagram.jpgAnterior and posterior views of the larynx showing the epiglottis above the hyoid bone and thyroid cartilage, with the tracheal cartilages below https://www.therespiratorysystem.com/respiratory-system-functions/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2017/10/Trace-the-Airflow-Pathway-Through-the-Respiratory-System.jpgDiagram of the pathway of air through the respiratory system, from the nostrils and nasal cavity down the trachea and bronchi to the alveolihttps://www.therespiratorysystem.com/wp-content/uploads/2017/10/Respiratory-System-Functions.jpgLabeled chart of respiratory system functions naming the job of the nasal cavity, pharynx, larynx, trachea, bronchi, alveoli and diaphragm https://www.therespiratorysystem.com/gas-exchange/2026-11-02https://www.therespiratorysystem.com/assets/img/diagrams/gas-exchange/hero.webpDiagram of gas exchange between an alveolus and a pulmonary capillary: oxygen diffuses into the blood and carbon dioxide diffuses outhttps://www.therespiratorysystem.com/wp-content/uploads/2017/09/Gas-Exchange-in-the-Lungs-Image.jpgLabeled illustration of alveoli and their capillaries, with a close-up of oxygen entering red blood cells and carbon dioxide leaving themhttps://www.therespiratorysystem.com/assets/img/diagrams/gas-exchange/oxygen-pathway.webpSix-step diagram of the path of an oxygen molecule from an alveolus across the respiratory membrane to hemoglobin in a red blood cellhttps://www.therespiratorysystem.com/assets/img/diagrams/gas-exchange/lungs-vs-tissues.webpComparison chart of gas exchange in the lungs (external respiration) and in the tissues (internal respiration) https://www.therespiratorysystem.com/larynx/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2016/11/Larynx-Diagram.jpgSide view of the head and neck showing the larynx with its supraglottis, glottis, vocal cord and subglottis between the epiglottis and tracheahttps://www.therespiratorysystem.com/wp-content/uploads/2016/11/Larynx-Anatomy.jpgAnterior, side and posterior views of the larynx with the epiglottis, hyoid bone, thyroid and cricoid cartilages, vocal cords and tracheal rings https://www.therespiratorysystem.com/category/lower-respiratory-tract/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2015/12/Lower-Respiratory-Tract.jpgLabeled diagram of the lower respiratory tract: trachea, bronchi, bronchioles, alveoli and the lobes of both lungshttps://www.therespiratorysystem.com/wp-content/themes/Respiratory/images/respiratory-system-diagram.jpgLabeled respiratory system diagram marking the lower respiratory tract: trachea, primary bronchi, bronchioles, alveoli, lung lobes and diaphragm https://www.therespiratorysystem.com/lungs/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2017/09/Lungs.jpgLabeled diagram of the human lungs showing the trachea, primary bronchi, lobes, fissures, cardiac notch, pleura and diaphragmhttps://www.therespiratorysystem.com/wp-content/uploads/2017/09/Picture-of-Lung-Segments-Anatomy.jpgSegmental anatomy of the lungs in anterior, posterior and medial views, with each bronchopulmonary segment color coded and labeledhttps://www.therespiratorysystem.com/wp-content/uploads/2017/09/Gas-Exchange-in-the-Lungs-Image.jpgDiagram of gas exchange in an alveolus: oxygen moves from the air into capillary blood while carbon dioxide moves into the alveolus https://www.therespiratorysystem.com/nasal-cavity/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2017/07/Nasal-Cavity.jpgLabeled side-view diagram of the nasal cavity with the conchae, meatuses, olfactory region, hard palate and nasopharynxhttps://www.therespiratorysystem.com/wp-content/uploads/2017/07/Nasal-Cavity-Bones-Diagram.jpgDiagram of the bones forming the walls of the nasal cavity, including the ethmoid, sphenoid, maxilla, palatine and nasal bones https://www.therespiratorysystem.com/nose/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2017/12/External-Nose.jpgLabeled diagram of the external nose showing the root, bridge, dorsum, apex, alae and nostrilshttps://www.therespiratorysystem.com/wp-content/uploads/2017/12/Bones-and-Cartilages-in-the-Nose.jpgDiagram of the bones and cartilages of the nose: nasal bones, maxilla, lateral cartilage, septal cartilage and alar cartilageshttps://www.therespiratorysystem.com/wp-content/uploads/2017/12/Nose-Anatomy-Diagram.jpgSide-view cross section of the nose showing the nasal cavity, superior, middle and inferior conchae, sinuses and nasopharynx https://www.therespiratorysystem.com/paranasal-sinuses/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2018/03/Paranasal-Sinuses.jpgFront and side views of a face labeling the frontal, ethmoid, maxillary and sphenoid sinuses, the nasal cavity and the mucus membranehttps://www.therespiratorysystem.com/wp-content/uploads/2018/03/Paranasal-Sinuses-in-X-Ray-Image.jpgFront-facing skull X-ray with the dark air-filled frontal, ethmoid, maxillary and sphenoid sinuses labeled on both sideshttps://www.therespiratorysystem.com/wp-content/uploads/2018/03/Drainage-of-the-Sinus-Cavities-Diagram.jpgSide view of the lateral nasal wall showing where the frontal, ethmoid, maxillary and sphenoid sinuses open into the nasal cavity https://www.therespiratorysystem.com/pharynx/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2016/09/Pharynx.jpgSide view of the head and neck labeling the nasopharynx, oropharynx and laryngopharynx, with the soft palate, epiglottis, larynx and esophagus https://www.therespiratorysystem.com/respiratory-diseases/2026-11-02https://www.therespiratorysystem.com/wp-content/themes/Respiratory/images/respiratory-system-diagram.jpgLabeled diagram of the respiratory system marking the upper tract (nose, sinuses, pharynx, larynx) and lower tract (trachea, bronchi, lungs) https://www.therespiratorysystem.com/2026-11-02https://www.therespiratorysystem.com/wp-content/themes/Respiratory/images/respiratory-system-diagram.jpgRespiratory system diagram https://www.therespiratorysystem.com/trachea/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2017/03/Trachea.jpgLabeled diagram of the trachea running from the larynx to its bifurcation into the right and left bronchi inside the lungshttps://www.therespiratorysystem.com/wp-content/uploads/2017/03/Carina-of-Trachea.jpgBifurcation of the trachea viewed from above, showing the carina ridge between the openings of the right and left bronchihttps://www.therespiratorysystem.com/wp-content/uploads/2017/03/Trachea-Cross-Section-Anatomy.jpgCross section of the trachea showing the mucosa, submucosa, C-shaped hyaline cartilage ring, adventitia, trachealis muscle and esophagus https://www.therespiratorysystem.com/category/upper-respiratory-tract/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2015/12/Upper-Respiratory-Tract.jpgLabeled diagram of the upper respiratory tract: nasal cavity, paranasal sinuses, nostril, oral cavity, pharynx, larynx and vocal cordshttps://www.therespiratorysystem.com/wp-content/themes/Respiratory/images/respiratory-system-diagram.jpgLabeled diagram of the human respiratory system showing the nasal cavity, pharynx, larynx and trachea above the lungs https://www.therespiratorysystem.com/glossary/choanae/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2018/01/Choanae-Internal-Nares.jpgDiagram of the choanae (internal nares) at the back of the nasal cavity, opening into the nasopharynx on either side of the vomer https://www.therespiratorysystem.com/glossary/2026-11-02https://www.therespiratorysystem.com/wp-content/themes/Respiratory/images/respiratory-system-diagram.jpgLabeled diagram of the human respiratory system with the nostrils, nasal cavity, pharynx, larynx, trachea, bronchi, lung lobes and diaphragmhttps://www.therespiratorysystem.com/wp-content/uploads/2017/11/Lung-Lobes.jpgDiagram of the lung lobes: superior, middle and inferior lobes of the right lung and superior and inferior lobes of the left lung https://www.therespiratorysystem.com/inferior-nasal-concha/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2015/04/Inferior-Nasal-Concha.jpgFront view of the skull labeling the inferior nasal concha in the lower nasal opening beside the vomer, with nearby skull bones https://www.therespiratorysystem.com/glossary/intercostal-muscles/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2018/05/Intercostal-Muscles.jpgFront view of the rib cage showing the intercostal muscles between the ribs, with a close-up of the external, internal and innermost layershttps://www.therespiratorysystem.com/wp-content/uploads/2018/05/Intercostal-Muscles-Function.jpgRib cage during inhalation and exhalation: external intercostals lift the ribs as the diaphragm contracts, internal intercostals lower them https://www.therespiratorysystem.com/glossary/lung-lobes/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2017/11/Lung-Lobes.jpgLabeled diagram of the lung lobes: right lung with superior, middle and inferior lobes, left lung with two lobes, fissures and cardiac notch https://www.therespiratorysystem.com/middle-nasal-concha/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2015/04/Middle-Nasal-Concha.jpgFront view of the skull labeling the middle nasal concha of the ethmoid bone between the superior and inferior nasal conchae https://www.therespiratorysystem.com/nasal-conchae-nasal-turbinates/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2015/04/Nasal-Conchae.jpgLabeled side view of the nasal cavity and front view of the skull showing the superior, middle and inferior nasal conchaehttps://www.therespiratorysystem.com/wp-content/uploads/2015/04/Nasal-Turbinates.jpgCoronal section of the nose showing the superior, middle and inferior turbinates, the meatuses below them, the septum and sinuses https://www.therespiratorysystem.com/nasal-meatus/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2015/04/Nasal-Meatus-Anatomy.jpgFront cross-section of the nose labeling the superior, middle and inferior meatuses beneath the matching nasal conchae on both sideshttps://www.therespiratorysystem.com/wp-content/uploads/2015/04/Nasal-Meatus.jpgSide view of the lateral nasal wall showing the meatuses with the sinus openings, semilunar hiatus and nasolacrimal duct opening labeled https://www.therespiratorysystem.com/glossary/nasopharynx/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2018/02/Nasopharynx.jpgSide view of the head showing the nasopharynx behind the nasal cavity, with the adenoids, Eustachian tube opening and soft palate https://www.therespiratorysystem.com/glossary/nostrils/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2018/01/Nostrils-Anatomy.jpgLabeled diagram of the nostrils (external nares) on the underside of the nose, with the ala, columella and nasal septum https://www.therespiratorysystem.com/glossary/oral-cavity/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2018/04/Oral-Cavity.jpgFront view of the open mouth labeling the lips, gums, teeth, hard and soft palate, uvula, tongue, frenula and submandibular duct openinghttps://www.therespiratorysystem.com/wp-content/uploads/2018/04/Oral-Cavity-Anatomy-Diagram.jpgSide view of the head showing the oral vestibule, oral cavity proper, hard and soft palate, uvula, tongue and oropharynx below the nasal cavity https://www.therespiratorysystem.com/superior-nasal-concha/2026-11-02https://www.therespiratorysystem.com/wp-content/uploads/2015/04/Superior-Nasal-Concha.jpgFront view of the skull labeling the superior nasal concha high in the nasal cavity, with the middle and inferior conchae below https://www.therespiratorysystem.com/about-us/2026-11-02 https://www.therespiratorysystem.com/contact-us/2026-11-02 https://www.therespiratorysystem.com/editorial-policy/2026-11-02 https://www.therespiratorysystem.com/privacy-policy/2026-11-02 https://www.therespiratorysystem.com/terms-of-use/2026-11-02 https://www.therespiratorysystem.com/dmca/2026-11-02 https://www.therespiratorysystem.com/sitemap/2026-11-02