The relative transmission and/or absorption of portions of the light spectrum are the basis for which of the following?
a. Amperometry c. Spectrophotometry
b. Plethysmography d. Potentiometry
ANS: C
Oximeters operate on the principle of spectrophotometry, which is based on the relative transmis-sion or absorption of portions of the light spectrum. Amperometry refers to measuring an electri-cal current at a single applied potential. A plethysmograph is a type of instrument that is used to measure changes in volume within an organ or the entire body. Potentiometry uses changes in voltage to measure pH and PCO2.
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