By Modern Vascular
There are two pathways that arteries take: The pulmonary circuit and the systemic circuit. Systemic arteries carry oxygenated blood away from the heart to the tissue of the body. Pulmonary arteries carry deoxygenated blood from the right side of the heart to the lungs for oxygenation. Arteries are thicker than veins because they deal with the pressure of the blood being pumped from the heart.
Veins have different jobs on the pulmonary and systemic circuits. Pulmonary veins transport oxygenated blood from the lungs to the left side of the heart, to be pumped out to the rest of the body through the systemic arteries. Systemic veins return deoxygenated blood back to the heart to be reoxygenated. Veins have valves to prevent the backflow of blood and pooling, which can cause venous insufficiency.
Pulmonary circulation is the movement of blood between the lungs and the heart. In the pulmonary circuit, the arteries deliver deoxygenated blood from the heart to the lungs for oxygenation. The veins return the blood to the heart from the lungs after it has been oxygenated.
Systemic circulation is when the oxygenated blood in the heart is pumped out to the rest of the body through the arteries and returned to the heart for reoxygenation through the veins. In both the pulmonary and systemic circuits the veins and arteries have opposite functions to work together to form the cardiovascular system.
Veins and arteries work together to deliver blood throughout the body and return it back to the heart. Arteries are stronger blood vessels because they deal with the pressure of the heart pumping blood throughout the body. Veins have valves that prevent the blood from flowing backward and prevent pooling.
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