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Blood's Passage around the body

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Blood starts its journey throughout the body by exiting the left ventricle through the aorta in the heart. At this stage blood is rich in oxygen. The aorta goes into two main arteries in the head, the left and right carotid arteries, and one artery to each arm. The aorta moves down the chest and into the abdomen. The abdomen contains 3 main arteries to the liver and intestines, and one to each kidney. The aorta then divides into the right and left iliac arteries, which supply blood to the pelvis and legs. From the arteries the blood flows into arterioles. ...read more.


From the capillaries, blood enters the venous system, first passing through small vessels called venules. Some solutes diffuse across venules walls, which are a bit thicker than capillary walls. From the venules, the blood enters the jugular vein, which receives blood from the brain, tissues of the head, neck, shoulders and arms. All the veins from the various parts of the body eventually merge into two large blood vessels, one called the superior vena cava, the other called the inferior vena cava. The superior vena cava collects blood from the head, arms and neck, and the inferior vena cava receives blood from the lower part of the body. ...read more.


This is called the systematic circuit, in which the hearts left half pumps the oxygenated blood to all regions of the body where oxygen is needed. There are a few short cuts that the blood takes through its circulation. On leaving the intestines, the blood does not go directly back to the heart, but instead is drained into the hepatic portal system of veins. This allows blood that may be rich in digested food to go directly to the liver. Once it reaches the liver it goes through special capillaries called sinusoids and then goes to the hepatic veins. These eventually lead to the inferior vena cava. ?? ?? ?? ?? Blood Circulation A Brief Overview ...read more.

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