The wall of an artery consists of three layers. About 10 percent of the total blood volume is in the systemic arterial system at any given time. The arterioles play a key role in regulating blood flow into the tissue capillaries. Blood is pumped from the ventricles into large elastic arteries that branch repeatedly into smaller and smaller arteries until the branching results in microscopic arteries called arterioles. Systemic arteries transport oxygenated blood from the left ventricle to the body tissues. Pulmonary arteries transport blood that has a low oxygen content from the right ventricle to the lungs. ArteriesĪrteries carry blood away from the heart. Based on their structure and function, blood vessels are classified as either arteries, capillaries, or veins. The other system, the systemic vessels, carries blood from the left ventricle to the tissues in all parts of the body and then returns the blood to the right atrium. One system, the pulmonary vessels, transports blood from the right ventricle to the lungs and back to the left atrium. The vessels make up two closed systems of tubes that begin and end at the heart. Acknowledgements Classification & Structure of Blood Vesselsīlood vessels are the channels or conduits through which blood is distributed to body tissues.
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