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: The pressure in the lungs decreases, but that in the box increases
Description: Plethysmography measures changes in volume in different areas of your body. It measures these changes with blood pressure cuffs or other sensors. These are attached to a machine called a plethysmograph. Plethysmography is especially effective in detecting changes caused by blood flow. It can help your doctor determine if you have a blood clot in your arm or leg. It can also help your doctor calculate the volume of air your lungs can hold Ref: guyton and hall textbook of medical physiology 12 edition page number:316,317,318
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