Spirometry Practical Physiology

In: Science

Submitted By Gulia
Words 736
Pages 3
1. According to the results obtained, the experimental VC is lower than the predicted VC value. The experimental values for VC, FRC and TLC are substantially lower than the predicted values which are based on heights and ages. The differences in the results could possibly be because to the person has a smaller chest cavity, a lower level of fitness or a habit of smoking which decreases FRC. Psychological effects such as self-consciousness of the person could have also caused the differences in the values. The structure of the equipment, having a long connection tube also adds on to the dead space hence increasing the level of CO2 over time, which can alter the results.

2. As shown in our results, the time period between the expiration peaks in flow pattern is shorter than the inspiration peaks. This shows that exhalation is a passive action because it does not require effort, therefore air flows out faster and expiration occurs over a shorter time compared to inspiration. During inspiration, muscular effort is needed and the pattern of the flow shows that period of inspiration is longer than expiration.

3. RV cannot be determined by ordinary spirometry because it is physically not possible to exhale the RV. The RV is there because during inspiration a lower pressure is created in out lungs. If the RV is not present, our lungs would collapse. While spirometry cannot determine this, special techniques have been made to determine this, such as nitrogen washout.

4. The experimental values are significantly lower than the predicted values. This could because to the person having weak lung muscles because of regular smoking. It may also be because the person has asthma, or has a lower fitness level.

5. The ratio tells us the maximum amount of air that can be forcefully pushed out by the lungs and how efficient the lungs are at exhaling forcefully as…...

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