What percentage of pulmonary surfactant is comprised specifically of the four surfactant apoproteins?

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One of the major roles of the dorsal respiratory group is to:

In the accompanying Figure 4, which panel most closely illustrates the profile of PCO2 along the pulmonary capillary?   

If the pulmonary diffusing capacity for carbon monoxide (DLCO) remains constant but the cardiac output (Q˙) decreases by half:

Which of the following is/are defined as primary lung volumes?

The conducting airways:

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The parameter that is unique in influencing both lung volume and airflow during the time course of an inspiration is:

The central pattern generator for ventilation resides in the: