BISC 104Lxg Lecture Notes - Lecture 20: Pharynx, Trachea, Middle Ear
5 Apr 2017
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Document Summary
Providing the body with essential oxygen, needed to extract energy from food (aerobic respiration in mitochondria - atps ) without o2, die within few min. Structure: nasal septum divides the inside into two naval cavities; mucous membrane covers inner surfaces. Functions: cleans incoming air; warms and moistens are so that lung surfaces do not dry out (oxygen cannot cross dry membranes); provides the sense of smell. Structure: large air-filled spaces in the bones of the face; connect to nasal cavities. Connected to the middle ear via auditory tubes; helps equalize pressure. Serves as a selective entrance to lower respiratory system. The trachea is a five inch tube that connects the larynx to the bronchial tree. Minute sacs where oxygen diffuses from the inhaled air into the blood. Carbon dioxide diffuses from the blood into the alveolar air to be exhaled. Volume of air inhaled or exhaled during a normal breath. Transport of gases between the lungs and the cells.
