blood is never blue but arterial blood lacking oxygen is darker...
venous blood is dark red
arterial blood is bright red
capillary blood is brick red
Oxygenated blood color is Red so when you bleed it is red because it is oxygenated.In your body unoxygenated its purplish-blue.
It is an urban myth that unoxygenated blood (in veins) is blue - it is actually dark red.
The coronary veins drains the unoxygenated blood and empty it into the coronary sinus, which empties into the right atrium.
Veins
all blood is red but people may think its blue. oxygenated blood comes from the arteries and it is usually bright red. unoxygenated blood is dark red and comes from the vein. so if you are a child and you get a cut and an adult ask you what color is the blood, dont think they are crazy
Unoxygenated
Bicuspid valve
Veins. Veins carry unoxygenated blood towards the heart.
Almost all vertebrates use the iron compound hemoglobin as the oxygen-transporting compound in their blood. Oxygenated hemoglobin is bright red, unoxygenated darker red.
Unoxygenated blood would be found in a vein.
Right Ventricle
Pulmonary semi-lunar