Blood vessels

Blood vessels are part of the circulatory system and function of blood flow throughout the body. The types of the most important, arteries and veins, also so called because they carry blood out or go to the heart. Blood vessels helps the heart work to or red blood cells circulate throughout the body erythrocytes. and circulate nutrients, oxygen and carry out carbon dioxide. The function of the arteries of the heart is to circulate blood throughout the body, while the function of veins is the blood flow to the heart of the entire body.

Veins or veins are the vessels that carry blood toward the heart. Its blood contains a lot of carbon dioxide. Generally located near the surface of the body and looks bluish. The walls of veins and thin and inelastic. if touched, his heart rate is not felt. Veins have valves along the veins. This valve serves to keep the blood flowing in one direction. With this valve, the flow of blood flowing to the heart. If the injured vein, the blood does not shine but seeps.
Of the whole body, vein empties into a large vein, called the vena cava. These blood vessels into the heart through the right atrium. After the gas exchange in lungs, blood flow to the heart again through the pulmonary vein. These veins carry oxygen-rich blood. Thus, the blood in all veins contain lots of carbon dioxide except the pulmonary vein.

Artery or arteries are muscular blood vessels that carry blood from the heart. This function is in contrast to the function of veins that carry blood toward the heart.
Circulatory system is essential in maintaining life. Its main function is to deliver oxygen and nutrients to all cells, and transporting wastes are like carbon dioxide. In developing countries, two incidents of death due to myocardial infarction and stroke in the arterial system, such as atherosclerosis.