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Arterial blood is rich in oxygen. Blood containing a lot of oxygen is usually bright red.
Velda Spinka
Wiki User
∙ 11y agoHumans and other animals have a protein called haemoglobin in our blood. It is used to carry oxygen from our lungs, to the all the tissues in the body, including the heart and brain.
When haemoglobin is attached to oxygen, it is red in colour. Otherwise, it is blue.
Arteries carry blood full of oxygen from our heart around our body, so the blood carried through arteries is bright red.
Veins carry blood back to our heart and lungs, once the oxygen in it has been used up by the tissues. Because there is less haemoglobin attached to oxygen in the veins, they have a bluish tinge.
Wiki User
∙ 11y agoArteries and viens have different colors for a very interesting reason. Viens are blue because they are caring blood to the lungs for more oxygen. Arteries are red because they are carring blood with oxygen to parts of the body that need it.
Wiki User
∙ 12y agoarteries are red because they move oxygenated bloodfrom the heart around the body. veins are blue because the blood is going back to the heart with no oxygen in it
Wiki User
∙ 12y agobecause they carry oxygenated blood to heart and the blood is in red colour.
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