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Then inspire a normal tidal inspiration, breathe out a normal tidal expiration,

ID: 195798 • Letter: T

Question

Then inspire a normal tidal inspiration, breathe out a normal tidal expiration, put the mouthpiece to your mouth, and eshak as forobly as possble. Don't cheat and take in a large breath first As before, perform several 4 Mossre the expinatory reserve sohme: Before taking this measurement, inhale and exhale a series of tidal volumes. 2: Average Expiratory Reserve Volume 5 Mossee the sital capacity: As before, inhale and exhale a series of tidal volumes. Then bend over and exhale msinally Once you have exhaled as much air as you can, raise yourself upright and inhale as much air as you pm11·can ( i til you feel like you are nearly about to pop") Quickly place the mouthpiece to your mouth and eshale as forcibly and as long as possible. Take several measurements (you may want to give yourself a minute to iosx herwven ncasurcements), anud record dhe data helow Average Vital Capacity 6Cale the inspinatoury reseree sohume: Even though the hell or handheld s spirometer cannot measure inspiratory clone, you can calculate this volume now that you have the vital capacity (VC), tidal volume (TV), and nervse volume ERV). Recall that VC -TV+IRV +ERV. Rearrange the equation: IRV VC + rrange the equation: IRV - VC+ (TV +ERV) expiratory IRV 7 H do your compare se valucs compare with the average values? What factors, if any, do you think may have affected your

Explanation / Answer

Hi
Expiratory reserve volume
measurement 1: 850
measurement 2: 1000
measurement 3: 940
Average = 930 ml

Vital capacity
measurement 1: 4500
measurement 2: 4800
measurement 3: 4700
Average = 4666 ml

IRV = VC - (TC+ERV)
    = 4666 - (500 + 930)
    = 3236 ml

The average IRV is 1900 - 3300 ml. So the calculated value is within the normal range. The ERV is 700 - 1200 ml, the calcualte is 930 ml , which is within the normal range.