Physiology 1021 Lecture Notes - Lecture 2: Pulmonary Pleurae, Thoracic Cavity, Abdominal Cavity

• School: Western University
• Department: Physiology
• Course: Physiology 1021
• Professor: John Ciriello

Document Summary

Respiratory system organization and function: functions of the respiratory system, provides oxygen to the blood, removes carbon dioxide to the blood, regulates blood ph, speech, microbial defense, traps and dissolves small blood clots. Includes humidification, temperature change, mucocilliary elevator (microbial defense: respiratory zone, gas exchange, microbial defense (macrophages) Mechanics of pulmonary ventilation: boyle"s la(cid:449) states the pressure is inversely proportional to volume, moving air into the lungs requires a gradient. Its advantages are: the lung does not collapse even at the end of expiration. It is very powerful recoiling force and prevents the lungs from expanding and promotes lung collapse causing a decrease in compliance: pulmonary surfactant, 2/3 contribution, made of phospholipids spread over the top of the water in our alveoli. Lung volume measurements and indications of pathology: spirometer, tests lung function, tidal volume (purple, volume of inhalation & exhalation during normal breathing.