The principle that the respiratory system moves with 2 degrees of freedom describes the basis for which of the following?

a. Inductive plethys-mography c. Strain gauge trans-ducer
b. Volume plethys-mography d. Nitrogen washout


ANS: A
Inductive plethysmography is based on the principle that the respiratory system moves with 2 degrees of freedom. That is, it consists of two moving parts: the rib cage and the abdomen. Dur-ing inspiration, the rib cage moves outward as the lungs expand in the thorax. Simultaneously, the abdomen is displaced outward by the downward movement of the diaphragm.

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