PSL301H1 Lecture Notes - Lecture 2: Elastic Fiber, Thoracic Wall, Intrapleural Pressure

• School: UTSG
• Department: Physiology
• Course: PSL301H1
• Professor: Christine Wong

Document Summary

Boyle"s law v p1 v1 = p2 v2 v boyle"s law is a physical law: p1 v1 = p2 v2. Pressure and flow v inspiration: inspiratory muscles contract, alveolar pressure drops by 1 mmhg v end of inspiration: volume of air is at its maximum. Alveolar pressure is equal to atmospheric pressure v expiration: inspiratory muscles cease. Elastic recoil of the lungs returns the diaphragm and rib cage to original position. air pressure in lung increases 1 mmhg above atm pressure v active expiration: occurs when hyperventilation or co2 increase. Internal intercostal and abdominal muscles v what happens to different parameters during breathing: one breath includes both inspiration and expiration v image, alveolar pressure (red) Pressure inside alveoli: intrapleural pressure (blue) Psl301 human physiology ii: volume of air moved inside the lungs (black) v inspiration, inspiratory muscles contract, alveolar pressure drops by 1 mmhg, alveolar pressure.