![]() Air passages undergo 23 orders of branching in the lungs which significantly increases cross sectional area for flow.Made up of rigid passageways that serve to warm, moisten, and filter the inhaled air: nose, nasal cavity, pharynx, larynx, trachea, primary bronchi, tertiary bronchi, bronchioles, terminal bronchioles. Nose -> pharynx -> larynx -> trachea -> primary bronchi -> secondary bronchi -> tertiary bronchi -> bronchioles -> terminal bronchioles -> respiratory bronchioles -> alveolar duct -> alveoliĬlick here for an animation that provides an overview of the respiratory system, including its functions and organs. Hairs, twisted pathways, goblet cells, mucous glands, lysozyme in the mucus all help defend the body against infection by airborne pathogens. When airborne molecules are inhaled and dissolve in the mucus in the nose, the molecules can bind to receptors in the olfactory epithelium. Sound allows speech, singing, and nonverbal communication The larynx, nasal cavity, paranasal sinuses, teeth, lips, and tongue work to produce sound. Inhalation (inspiration) draws gases into the lungs.Įxhalation (expiration) forces gases out of the lungs.Īs gases pass through the nasal cavity and paransal sinuses, inhaled air becomes turbulent.
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