Which amount of surfactant resulted in the greatest amount of airflow? PhysioEX 9.0 - Exercise 7, ...

Which amount of surfactant resulted in the greatest amount of airflow?
    4
    2
    0
    Amounts 2 and 4 gave the same airflow.


How did the pressure in the left intrapleural cavity change when the valve was opened?
    It went from a negative number to zero.
    The pressure in the intrapleural cavity equalized with the atmospheric pressure.
    It went from a positive number to a negative number.
    It went from a positive number to a negative number and the pressure in the intrapleural cavity equalized with the atmospheric pressure.
    It went from a negative number to zero and the pressure in the intrapleural cavity equalized with the atmospheric pressure.


How did the total air flow in this trial differ from that in the previous trial in which the pleural cavities were intact?
    It doubled in value.
    It went to zero.
    It did not change
    It was cut in half.