Lecture 5 – Respiration IV

This is not the amount of fresh air just air total

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This is not the amount of FRESH air, just air total You breathe out, but when you breathe in some of the dead space air comes back in About 350 mL is the fresh air (total breath – dead space) If you completely emptied our lung every time you took a breath, it would fluctuate a lot The functional reserve capacity prevents it Since there is always air in the alveoli, there is still some oxygen exchange going on  even if you are exhaling Because of the functional reserve capacity, the PO2 of blood stays steady PO2 in the alveoli does not equal Patm It is a little lower This is because dead space before inspiration the air in the dead space has a lower  PO2 since it’s already been in the alveoli Mixing old air with fresh air Also functional reserve capacity  ***KNOW THE VOLUMES***** How much gas is in the alveolar gas compartment at the end of expiration? 2-3 L 500 mL of tidal volume goes in, pushes dead space air and 350 mL of fresh air into the  alveoli If you breathed through a long glass tube, it would create a lot more anatomical dead  space Long enough tube would make you stop breathing PO2 would keep decreasing Alveolar Ventilation Tidal volume – total amount of air you breathe in Total ventilation per minute is the minute ventilation
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VE = Vt X F Tidal volume times frequency  Alveolar Ventilation  Volume of fresh air (VE-Vd) * F For this example it would be 4200 mL/min Lung Compliance
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