is a muscular funnel -- is part of respiratory & digestive systems -- has 3 regions
-divides up into bronchi at about the heart level
pP O2 ~ 40 mmHg in blood pP O2 in alveolar air = 105 mmHG
How will oxygen diffuse? The partial pressure from the alveoli to the blood
Define tidal volume.
Amount of air inhaled/exhaled in one breath
Define inspiratory reserve volume.
Amount of extra air inhaled with maximum effort (beyond normal TV)
Define expiratory reserve volume.
Define residual volume.
Amount of air in lungs after ERV – can’t be voluntarily exhaled
What is inspiratory capacity?
Maximum amount of air inhaled after normal tidal expiration
What is functional residual capacity?
Amount of air left in lungs after normal tidal expiration: RV+ERV=FRC
What is vital capacity?
Normal inspiration plus forced exhalation (deepest possible breath): TV+IRV+ERV=VC
What is total lung capacity?
Maximum air amount lungs can handle: RV+VC=TLC
What is minute respiratory volume?
Air inhaled per minute