Physiology A man connected to a body plethysmograph for estimation of FRC inspires against a closed glottis. Which of the following statements is true? A The pressure in both the lungs and the box increases B The pressure in both the lungs and the box decreases C The pressure in the lungs decreases, but that in the box increases D The pressure in the lungs increases, but that in the box decreases 💡 Explanation A man connected to a body plethysmograph for estimation of FRC inspires against a closed glottis. Which of the following statements is true? ✓ Correct Answer: C. The pressure in the lungs decreases, but that in the box increases