The organ in charge of pumping blood is the heart and circulated throughout the body by the blood vessels. The human heart has four chambers, and the chest cavity is encased by perikardia. The four heart chambers, namely the right atrium and left atrium, right ventricle and the left ventricle.
Human circulatory system including blood circulation and double covered. Blood circulation is always closed due to circulating blood in the vessels of the heart. Double blood circulation because the blood circulating through the heart twice.
a. Small circulation is the blood starts from the heart (right ventricle) to the lungs, back to the heart as much as (the left atrium). Blood is carried from the heart to the lungs in the form of a rich blood and carbon dioxide is returned to the heart of oxygen-rich blood. Under this scheme small circulation. The heart (the right ventricle) to the lungs to the heart (left atrium).
b. Large blood circulation is the blood of the heart (the left ventricle) to the rest of the body, back to the heart (right atrium). The left ventricle of the heart contracts to pump blood throughout the body through the net except the aorta to the lungs and back to the heart (right atrium) in the form of dirty blood. Scheme circulatory big heart (the left ventricle) to the rest of the body to the heart (right atrium).
c. Porta Systems, where the blood of an organ prior to the heart, stop by prior to other organs in humans and mammals live sifina portahepatil. Here the blood from the digestive tract prior to stopping heart to heart. So that the liver receives blood from two vessels, namely the tone of the heart that carries clean blood (arterial) blood from the portal vein and containing venous blood (CO2-rich and rich nutrients).
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