# Essay about Lab Simulation Exercise 7: Respiratory System Mechanics

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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?) This "dead space" of air needs to stay in your lungs constantly; otherwise the lung will completely deflate. If the lung has every bit of air sucked out of it, it will collapse and need to be re-inflated. 2.) How do you measure a person’s RV in a laboratory? By the air remaining in the lung 3.) Draw a spirogram that depicts a person’s volumes and capacities before and during a significant cough. Additional Questions for Activity 1. The following questions…show more content…
Returned to normal were TV, ERV, FEV1 (%); smooth muscles in the bronchioles didn't return to normal blue mucus still blocks the airway 6.) How much of an increase in FEV1 do you think is required to be considered significantly improved by the medication? 10-15% improvement 7.) With moderate aerobic exercise, which changed more from normal breathing, the ERV or the IRV? How well did the results compare with your prediction? IRV changed more with moderate activity 8.) Compare the breathing rates during normal breathing, moderate exercise, and heavy exercise. TV increased over normal breathing with both moderate and heavy exercise. Activity 3. Effect of Surfactant and Intrapleural Pressure on Respiration Chart 3: Effect of Surfactant and Intrapleural Pressure on Respiration Surfactant Intrapleural pressure left (atm) Intrapleural pressure right (atm) Airflow left (ml.min) Airflow right (ml/min) Total Airflow (ml/min) 0 -4 -4 49.69 49.69 99.38 2 -4 -4 69.56 69.56 139.13 4 -4 -4 89.44 89.44 178.88 0 -4 -4 49.64 49.64 99.38 0 0.00 -4 0.00 49.64 49.69 0 0.00 -4 0.00 49.69 49.69 0 -4 -4 49.69 49.69 99.38 1.) Why is normal quiet breathing so difficult for premature infants? They don't have much surfactant. 2.) Why does a pneumothorax frequently lad to atelectasis? If the lungs are broken down mechanically, then the chances of developing