KINE 1P90 Lecture Notes - Lecture 18: Spirometer, Functional Residual Capacity, Tidal Volume

• School: Brock University
• Department: Physical Education and Kinesiology
• Course: KINE 1P90
• Professor: David Schimmelpenninck

Document Summary

True if asked between environment and lungs (tophat) Air moves from region of high pressure to low pressure (down pressure gradient) Pressure gradients across each space determine if air is lowing into lungs or out of lungs. Pressure within alveoli (inal desinaion of air coming into body, then difuses into blood) Approx 756 mmhg at rest (4 mmhg less than atmospheric) Air lows down pressure gradient lungs lungs. When pressure in lungs is less than pressure in atmosphere, air rush into. When greater in lungs than pressure of atmosphere, air forced out of. Pressure in lungs change hen volume of lungs change. Pressure of a given quanity of gas is inversely proporional to its volume (assuming constant temperature) Move air into and out of lungs from atmosphere. Inspiraion: occurs when pressure in alveoli is less than atmospheric pressure (air moves into lungs) Expiraion: pressure in alveoli greater than atmospheric pressure (breathing out)