GENERAL KNOWLEDGE

Detailed explanation-1: -Blood that has been oxygenated (mostly flowing through the arteries) is bright red and blood that has lost its oxygen (mostly flowing through the veins) is dark red. Anyone who has donated blood or had their blood drawn by a nurse can attest that deoxygenated blood is dark red and not blue.

Detailed explanation-2: -blood inside our bodies is blue, but it turns red when exposed to oxygen. Both deoxygenated (venous) blood and fully oxygenated (arterial) blood are red. Blood in the veins appears blue for a number of reasons.