Health Sciences 2330A/B Lecture Notes - Lecture 9: Thoracic Cavity, Parasympathetic Nervous System, Bronchodilator
6 Dec 2016
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Document Summary
Major organ: nasal cavities, sinuses, larynx, trachea, bronchi, lungs, alveoli. Functions: delivers air to alveoli (site where gas exchange occurs, gas exchange: oxygen in the bloodstream and co2 into the alveoli so it removes from the bloodstream, produces sound for communication. Main function: conduction of air to lower respiratory tract passage: external nares (nostrils) Cartilage (septal middle, alar lower sides, lateral nasal) Root, bridge, ala, nostril are the parts of the nose: nasal cavity. Cilia (hair like cells) create gently current moving contaminated mucus towards pharynx, where it is digested in stomach juices. Goes through vestibule (opening of the nose), then sup, mid, inf conchae then the choanae (passage to the nasopharynx. Conchae: air becomes turbulent circulating longer to be warmed. The pharynx belongs to digestive system and respiratory tract: nasopharynx (air only) Contains pharyngeal tonsils: oropharynx (air and food) Contains palatine and lingual tonsils: laryngopharynx (air and food) Opening that connects the pharynx to the larynx.
