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what is the actual colour of blood flowing through vein,arteryand capillary?

Arteries - Bright red

Veins - Dark red

Capillaries - colour changes due to presence of  both oxygenated and deoxygenated blood.

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Through vein: Bluish due to presence of CO2 

Through artery: More redder than in veins as it carries oxgenated blood from lungs

Cappilaries have red coloured blood passing through it.

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