Lab 7: Respiratory System Mechanics

1 .       Refer to Activity 1: Measuring Respiratory Volumes. Does the expiratory reserve volume include tidal volume? 

2 .       What is expiratory reserve volume? 

3 .       Refer to Activity 2: Examining the Effect of Changing Airway Resistance on Respiratory Volumes. What happened to the FEV1 (%) as the radius of the airways was decreased? 

4 .       What is the FEV1 (%)? 

5 .       Refer to Activity 3: Examining the Surfactant. How did the airflow change when surfactant was applied? 

6 .       How would you explain the effects of surfactant on airflow?  

7 .       Why do premature infants have trouble breathing? 

8 .       Refer to Activity 4: Investigating Intrapleural Pressure. What happened to the lung in the left side of the bell jar, when the valve was opened? 

9 .       How did the pressure in the left lung differ from that in the right lung, after the valve was opened? Choose all that apply: 

10 .       What caused the left lung to deflate? Choose all that apply: 

11 .       How did the total airflow in this trial compare with that in the previous trial in which the pleural cavities were intact? 

12 .       What would happen if the two lungs were in a single large cavity instead of separate cavities? 

13 .       What happened to the deflated lungs? 

14 .       Explain why the lungs do not inflate when the valve is closed. 

15 .       Why did the lung function in the deflated (left) lung return to normal after you clicked Reset? 

16 .       Refer to Activity 5: Exploring Various Breathing patterns. What happened to the PCO2 during rapid breathing? 

17 .       How would you explain a decrease in PCO2during rapid breathing? 

18 .       Refer to Activity 5: Rebreathing. What happens to PCO2 over the course of the rebreathing activity? 

19 .       Refer to Activity 5: Breath Holding. What happened to the PCO2 during breath holding? 

20 .       Following breath holding, what happened to the breathing pattern when normal respirations resumed? 

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