PNB 2265 Lecture Notes - Lecture 11: Asthma, Pulmonary Artery, Osthe

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You need to bring oxygen rich gas next to the respiratory membrane and remove co2 rich gas with each exhale. Breathing is a mechanical process under conscious and unconscious control. Formed by vertebrate, ribs, intercostal muscles, sternum, diaphragm. Closed chamber with a limited amount of air. Movement of air in and out of the lung is known as pulmonary ventilation: to ventilate means to move gas. Double walled, closed sac, filled with fluid. Allows the lungs to move without friction. Change in volume of thoracic cavity is a change in volume of the lungs. P1v1 = p2v2: at a constant temp, a change in the volume (v1 to v2) of a space filled with gas, changed the pressure in that space. Changes in lung and chest wall change in volume of thoracic space: boyle"s law. Elastic like rubber band: rebounds to original shape when stretched, collapsing force. Connected to chest wall muscles: lung wall moves when they contract and relax.

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