Note that this is at a lower magnification than the three pictures above.This is the last part of the conducting portion of the respiratory system, and has the smallest diameter of all (less than 1mm). This picture shows a Terminal bronchiole (TB in the diagram). This helps to keep the lungs free of particles and bacteria. Transported upwards towards the pharynx by the cilia on the epithlium. The mucous, together with mucous from the gobletĬells traps particles from the air which are The watery secretions from the serous glands humidify the inspired air. The sub-mucosa contains glands which are mixed sero-mucous glands. Recoil of the trachea during inspiration and expiration, together The epithelium contains elastin, that plays a role in the elastic The epithelium is tall columnar pseudostratified The respiratory mucosa is made up of the epithelium and supporting The air, and to trap particles in mucous. The respiratory mucosa and submucosa are adapted to warm and moisten Together these hold the lumen of the trachea open, but allowįlexibility during inspiration and expiration. The trachealis muscle - a bundle of smooth muscle, and fibroelastic The gaps between the rings of cartilage are filled by Open by 20 tracheal cartilages, which are C-shaped rings of hyalineĬartilage. The trachea is a wide flexible tube, the lumen of which is kept
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