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