Circulatory System





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Uploaded on Nov 17, 2006

Starting from the oxygen that goes into the blood stream in the circulation system. The circulatory system is made up of your blood, you heart, and a network of blood vessels. The blood is a tissue make of fluid, cells and some other things. About 55% of your blood is plasma. There are blood cells that float in the blood. One is called the red blood cell, they are round disc shaped cells that carry oxygen to the tissues in the body and it also carries carbon dioxide away. The second kind of blood cell is a white blood cell that protects your body from disease and infection. The final main thing in your blood is platelets that help blood to clot after an injury, they link together to trap blood from slowing out of the wound. Oxygen is held by the red blood cells by the hemoglobin, the hemoglobin is an iron containing proteins molecule in red blood cells. In the lungs, oxygen blind to hemoglobin, it is carried to the body cells, where oxygen is released.

There are three main blood vessels, arteries, capillaries, and veins. Arteries are large, thick walls that carry blood away from the heart. While the blood flows through the arteries, the vessels become smaller into arterioles then to capillaries. In capillaries, blood has to line up one by one to get though the vessel. The final vessel is the vein, the large blood vessels that carry blood away from the tissue back to the heart.

There are four main parts of the heart and the heart is divided into two sections. The top section is called the artria and the body parts are called the ventricles. The right artria get blood from the head and body through major veins, and the left atria receive blood from the lungs. They both push the blood into the ventricle. The left ventricle pumps the blood out of the heart through the aorta and the right one pumps look into the lungs. Each time your heart beat, blood flows through your heart, which is called a pulse.


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