Answered

Which of the following statements about pressure in the lungs is true?

A. When the pressure in the lung is greater than inside the body, air flows from the body until the pulmonary and atmospheric pressures are equal.
B. When the pressure in the lung is greater than outside the body, air flows into the body until the pulmonary and atmospheric pressures are equal.
C. When the pressure in the lung is less than outside the body, air flows from the body until the pulmonary and atmospheric pressures are equal.
D. When the pressure in the lung is greater than outside the body, air flows from the body until the pulmonary and atmospheric pressures are equal.



Answer :

GinnyAnswer

Final answer:

Air flows into and out of the lungs based on pressure differentials.


Explanation:

When the pressure in the lung is greater than outside the body, air flows into the body until the pulmonary and atmospheric pressures are equal. Air flows based on pressure gradients; during inspiration, the intra-alveolar pressure becomes lower than atmospheric pressure, allowing air to flow into the lungs. Conversely, during expiration, the intra-alveolar pressure becomes higher than atmospheric pressure, causing air to flow out of the lungs.


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