Activity 1
1-1: When you forcefully exhale your entire expiratory reserve volume, any air remaining in your lungs is called the residual volume (RV). Why is it impossible to further exhale the RV (that is, where is this air volume trapped, and why is it trapped)? Residual volume is the air remaining in the airways and the lungs which prevents the alveoli from collapsing.
1-2: How do we measure a person’s RV in a laboratory? The helium dilution method is used to calculate the residual volume.1-3: What would be an example of an everyday respiratory event that the ERV button simulates? The ERV simulates a forced expiration.
1-4: What additional skeletal muscles are utilized in an ERV activity? Abdominal wall muscles and internal intercostal muscles contract during forced expiration.
1-5: What was the FEV1 (%) at the initial radius of 5.0 mm? (3541/4791) x 100=73.9%
1-6: What happened to the FEV 1 (%) as the radius of the airways decreased? How well did the results compare with your prediction? The FEV1 (%) decreased proportionately as the radius decreased.
1-7: Explain why the results from the experiment suggest there is an obstructive, rather than a restrictive pulmonary problem. The proportionate decrease in the FEV1 percentage is characteristic of an obstructive lung problem.
1-8: What test is used to distinguish between an obstructive and restrictive lung disease? FEV1
Hope this helps!
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