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Which pigment changes colour depending on the degree of oxygen saturation?

AHemoglobin
BMelanin
CBilirubin
DKeratin
Answer & Solution
Correct answer: A. Hemoglobin
1. Blood's colour varies with how much oxygen it carries. 2. Oxygenated and deoxygenated blood look different. 3. That is because hemoglobin is a pigment that changes color. 4. The colour depends upon the degree of oxygen saturation. _Source: OpenStax Anatomy and Physiology 2e (CC BY 4.0), Ch 18 'The Cardiovascular System: Blood', sections 18.1-18.6_
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