Medically the review by Gerhard Whitworth, R.N. — created by Scott Frothingham — to update on April 12, 2018

Arteries room blood vessels responsible for moving oxygen-rich blood away from the heart to the body. Veins space blood vessels that lug blood short in oxygen native the body earlier to the heart because that reoxygenation.

Arteries and also veins are two of the body’s main type of blood vessels. These vessels are channels that distribute blood come the body. They’re part of two closed solution of tubes the begin and end in ~ the heart. These solution of tubes room either:

Systemic. The systemic vessels are arteries that lug oxygen-rich blood from the heart’s left ventricle come the tissues in all components of the body. They then return oxygen-poor blood v the veins back to the heart’s appropriate atrium.

There room three species of arteries. Each form is created of three coats: outer, middle, and also inner.

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Elastic arteries are also called conducting arteries or conduit arteries. They have a thick center layer so they deserve to stretch in an answer to every pulse that the heart.Muscular (distributing) arteries room medium-sized. They draw blood from elastic arteries and also branch into resistance vessels. These vessels include tiny arteries and also arterioles. Arterioles space the smallest department of arteries that transfer blood away from the heart. They direct blood right into the capillary networks.

There room four varieties of veins:

Deep veins are located within muscle tissue. They have a corresponding artery nearby.Systemic veins are situated throughout the body from the legs approximately the neck, including the arms and also trunk. They transport deoxygenated blood back to the heart.

Use this interactive 3-D diagram to explore an artery.

Use this interactive 3-D diagram to explore a vein.


The wall surfaces of veins and arteries room both comprised of three layers:

Outer. Tunica adventitia (tunica externa) is the outer layer the a blood vessel, including arteries and also veins. It’s greatly composed of collagen and elastic fibers. These fibers permit the veins and also arteries come stretch a minimal amount. Castle stretch sufficient to be versatile while preserving stability under the push of blood flow. Middle. The middle layer the the walls of arteries and veins is called the tunica media. It’s make of smooth muscle and also elastic fibers. This class is more thickness in arteries and thinner in veins.Inner. The inner class of the blood vessel wall surface is referred to as tunica intima. This layer is do of elastic fiber and also collagen. That is consistency varies based on the form of blood vessel.

Unlike arteries, veins save on computer valves. Veins require valves to store the blood flowing towards the heart. Theses valves are an especially important in the legs and arms. Castle fight gravity to prevent the backflow of blood.

Arteries don’t need valves since the press from the heart keeps the blood flowing with them in one direction.


The cardiovascular system is a closed system of vessels called arteries, veins, and also capillaries. They’re all connected to a muscular pump dubbed the heart. The cardiovascular system keeps a continuous and controlled movement that blood the delivers nutrients and oxygen come every cell in the body. The does this through countless miles that capillaries between the arteries and also the veins.

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Capillaries. Capillaries space the smallest and also most numerous of the blood vessels. They connect between the arteries (which bring blood far from the heart) and also the veins (which return blood to the heart). The primary function of capillaries is the trading of materials, choose oxygen, between the blood and tissue cells.

Nutrients and also oxygen are delivered to every cabinet in your body with a circulatory system. The heart pumps oxygenated blood to your cells v arteries. That pumps oxygen-depleted blood far from her cells with veins.


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Medically the evaluation by Gerhard Whitworth, R.N. — created by Scott Frothingham — updated on April 12, 2018