Lecture 5 – Respiration IV

Pressure difference holding lungs open opposes the

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Pressure difference holding lungs open Opposes the elastic recoil of the lung Chest Wall Pressure difference holding chest wall in Opposes elastic recoil of the chest wall Reticular Network Trying to get the lung to collapse Thoracic walls are also like spring loaded mechanisms  Pleurae link the pressures and cause combined pressure-volume curve Curve between the pressures of the lung and chest wall pressure curve Lung Volumes At the end of a normal expiration, if you forcefully exhale, you can drop it to about 1200  mL at most This is the  expiratory reserve volume Residual volume –  no matter how hard to try to exhale there will be a large volume of  air still in the lungs If you forcefully inhale, the difference between that and the normal inhalation is called  the  inspiratory reserve volume Difference between volume at end of expiration and maximum you can suck in is  inspiratory capacity Difference between end of expiration and 0 is called  functional residual capacity Tidal volume –  How much air you breathe in with each breath Anatomic dead space that does not do gas exchange (150 mL) Alveolar gas 3000 mL These are static volumes
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Minute Volume How much air goes into and out of the lung per minute mL/min if you multiply that by breaths/min you get alveolar ventilation If you want to know how much air moves into and out of dead space, that is the minute  volume
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