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Blood appears a different colour in arteries and veins because hemoglobin's colour depends on:
AVessel diameter
BPlasma protein level
COxygen saturation
DBody temperature
Answer & Solution
Correct answer: C. Oxygen saturation
1. The colour difference comes from one molecule.
2. Arterial and venous blood carry different amounts of oxygen.
3. Hemoglobin is a pigment that changes color.
4. The colour depends upon the degree of oxygen saturation.
5. So the difference reflects oxygen saturation rather than the vessel itself.
_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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