Lab Quiz

Respiratory System Mechanics Lab Quiz

This activity contains 20 questions.

	Refer to Activity 1: Measuring Respiratory Volumes. Does the expiratory reserve volume include tidal volume?   No Yes Sometimes More information is needed to answer this question.

	What is expiratory reserve volume?   Dead air within the lung pocket. The amount of air that can be expelled after a normal tidal exhalation. The amount of air that can be expelled after a forced tidal exhalation. The amount of air that is left over after a normal tidal exhalation.

	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?   FEV1 (%) remained unaffected. FEV1 (%) decreased as the airway radius decreased. FEV1 (%) increased as the airway radius decreased. FEV1 (%) remained the same as the airway radius decreased.

	What is the FEV1 (%)?   FEV1 (%) is the amount of air that can be expelled from the lungs in one second during forced expiration. FEV1 (%) is the amount of air that can be inspired in one second during forced inhalation. FEV1 (%) is the amount of air that can be expelled from the lungs in one minute during forced expiration. FEV1 (%) is the amount of air that can be inspired in one minute during forced inhalation..

	Refer to Activity 3: Examining the Surfactant. How did the airflow change when surfactant was applied?   Airflow was unaffected when surfactant was applied. Airflow increased when surfactant was applied. Airflow decreased when surfactant was applied.

	How would you explain the effects of surfactant on airflow?   The surfactant had no effect on airflow. The surfactant enabled resistance to lung inflation. The surfactant increased resistance to lung inflation. The surfactant reduced resistance to lung inflation.

	Why do premature infants have trouble breathing?   Surfactant is not produced in premature infants. The lungs are not fully developed. Premature infants do not have a fully formed nervous system.

	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?   It deflated. The lung inflated, then deflated. There was no change to the lung. It inflated.

	How did the pressure in the left lung differ from that in the right lung, after the valve was opened?   The pressure in the left lung was constantly changing. There was no difference between the pressure of the two lungs. The pressure in the right lung was zero. The pressure in the left lung was zero.

	Which of the following did NOT cause the left lung to deflate?   The open valve allowed air to move into the intrapleural space. Air moved into the intrapleural space through the path of least resistance. A simulated pneumothorax There was no surfactant available.

	How did the total airflow in this trial compare with that in the previous trial in which the pleural cavities were intact?   The total airflow was reduced by 1/3. The total airflow was reduced by 1/2. The total airflow was reduced by 3/4. The total airflow was reduced by 1/4.

	What would happen if the two lungs were in a single large cavity instead of separate cavities?   Both lungs would overinflate. There would not be enough pressure to inflate both lungs. Both lungs would burst when the thoracic wall was punctured. Both lungs would collapse when the thoracic wall was punctured.

	What happened to the deflated lungs?   The lungs overinflated. The valves did not close. The lungs did not inflate when the valve was closed. The lungs inflated after the valves were closed.

	Explain why the lungs do not inflate when the valve is closed.   The excess air in the intrapleural space must be removed before the lungs will inflate. The air pressure wasn't great enough to reinflate the lungs. The atmospheric pressure was not great enough to re-inflate the lungs. The lungs did not have enough surfactant.

	Why did the lung function in the deflated (left) lung return to normal after you clicked Reset?   The air in the intrapleural space was increased. Surfactant was added, allowing the lungs to reinflate. The air was removed from the intrapleural space. The valve was closed, forming a vacuum in the chamber.

	Refer to Activity 5: Exploring Various Breathing patterns. What happened to the PCO2 during rapid breathing?   It decreased during rapid breathing. It remained constant. It increased during rapid breathing. There was no observable change.

	How would you explain a decrease in PCO2during rapid breathing?   Less CO2 was removed from the blood than normal. Less O2 was removed from the blood than normal. More O2 was removed from the blood than normal. More CO2 was removed from the blood than normal.

	Refer to Activity 5: Rebreathing. What happens to PCO2 over the course of the rebreathing activity?   PCO2 remains constant during rebreathing. PCO2 changes erratically during rebreathing. PCO2 decreases during rebreathing PCO2 increases during rebreathing

	Refer to Activity 5: Breath Holding. What happened to the PCO2 during breath holding?   It increased dramatically during breath holding. It remained the same during breath holding. It decreased slightly during breath holding. It decreased dramatically during breath holding.

	Following breath holding, what happened to the breathing pattern when normal respirations resumed?   It decreased. It became erratic. It stabilized. It became more rapid.

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