A Pulse Oximeter Differentiates Oxyhemoglobin from Deoxygenated Hemoglobin by Which

A pulse oximeter differentiates oxyhemoglobin from deoxygenated hemoglobin by which of the following methods?

A) Relating cyclical changes in light transmission through the sampling site.
B) Shining and comparing two wavelengths of light through the sampling site.
C) Direct measurement by a heated polarographic electrode applied to the skin.
D) Using a color sensing device that absorbs one wavelength of light through the skin.

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