How did the pressure in the left lung change when the valve was opened?
A) The pressure in the pleural cavity equalized with the atmospheric pressure.
B) It went from a positive number to a negative number and the pressure in the pleural cavity equalized with the atmospheric pressure.
C) It went from a positive number to a negative number.
D) It went from a negative number to zero and the pressure in the pleural cavity equalized with the atmospheric pressure.
E) It went from a negative number to zero.
Ans: D) It went from a negative number to zero and the pressure in the pleural cavity equalized with the atmospheric pressure.
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