Saturday 19 January 2013

Describe the major arteries and veins of the circulation system



Describe the major arteries and veins of the circulation system
The heart is a muscular organ which supplies blood to the entire part of the body by blood circulation system. The blood circulation system is made up of the vessels, the arteries and muscles to control the flow of the blood.

The heart is divided into four main sections. There are left and right atrium and the left and right ventricle. The blood enters the heart through the superior and inferior vena cava into the right atrium. Then it passes by the tricuspid valve into the right ventricle.

The blood vessels are a network of interconnecting veins and arteries. Blood leaves the left side of the heart and travels through arteries, which gradually divide into capillaries.

The arteries carry the blood away from the heart. Arteries are thick, tough and elastic tubes. Arteries’ walls are thicker than veins. The largest arteries are as thick as a thumb. The smallest arteries are thinner than hair. These thinner arteries are called arterioles. The aorta is the largest artery in the body. It is on the top of the left ventricle of the heart.
Veins carry the blood to the heart. The smallest veins are called venules. The veins carry dark red blood that doesn’t have much oxygen. Veins have thin walls and don’t need thick wall as the arteries as the blood is returned to the heart.
 
( copy from http://www.healinglightseries.com/tutorialheart.html)




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