Vein
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A vein is a blood vessel in the circulatory system of humans and most other animals that carries blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; except
Layers of vein wall shown in comparison to arterial wall
Main veins of the systemic circulation
Deep and superficial veins of the arm and near thorax
Diagram showing venous blood flow from capillary beds in some specific locations including the lungs, liver, and kidneys
Artery
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An artery is a blood vessel in humans and most other animals that takes oxygenated blood away from the heart in the systemic circulation to one or more parts of the body. Exceptions that carry deoxyge
Vein
…back to the heart; exceptions are those of the pulmonary and fetal circulations which carry oxygenated blood to the heart. In the systemic circulation, arteries carry oxygenated blood away from the heart, and veins return deoxygenated blood to the heart, in the deep veins. There are three sizes of veins: large…
The aorta is the largest blood vessel in the human body.