they are actually around the same color but light going through skin is absorbed differently the deeper the veins/arteries are. so the appereance of different color is just a measure of the deepness of said blood vessel. also arteries carry oxygen enriched bright red blood while veins carry oxygen deprived dark red blood, this difference is dark red vs bright red blood also contributes to the apparant change in color.
Arteries are red because they carry oxygenated blood (which is red) from the heart. Veins are blue because they return non-oxygenated blood back to the heart. Hemoglobin are the cells which carry oxygen in blood, and those cells change color depending on if they have oxygen or not. All blood looks red when someone bleeds, because when blue hemoglobin is exposed to air, it gets oxygen.
The question is a little vague but I think it's referring to the difference in color between blood in the arteries and veins. Blood in the arteries is bright red. It is coming from the heart, by way of the lungs where it picks up oxygen, and then goes out to the tissues of the body to deliver it's oxygen. After the blood has delivered the oxygen it appears darker as it travels in the veins back to the heart. So "dark blood" would be found in the veins.
arteries.
arteries
In the arteries and arterioles.
False. Oxygenated blood is found in the systemic arteries, which carry blood away from the heart to the body, but not in the pulmonary arteries, which carry blood from the heart to the lungs for oxygenation.
oxygen
The capillaries are the smallest blood vessels and are usually found between arteries and veins.
arteries and veins are found throughout the body. arteries carry blood away from the heart and veins carry it to the heart
Veins and arteries are found throughout the body. Veins transport "used" or de-oxygenated blood back to the heart whereas arteries deliver oxygenated blood throughout the body.
Arteries (except for the Pulmonary artery (which caries ed-oxygenated blood) and pulmonary vein (which carries oxygenated blood ))
No, but almost. The pulmonary artery is the ONLY artery that carries deoxygenated blood.
The three types of blood vessels in the body are veins, arteries, and capillaries. Arteries carry blood away from the heart. Veins carry blood to the heart. Capillaries are microscopic vessels that are found in the lungs and muscles.