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The image illustrates the dual circulation system of the human body depicting pulmonary and systemic circulation pathways; pulmonary circulation includes the transport of deoxygenated blood from the upper body through the pulmonary arteries to the right lung and left lung, then returning oxygenated blood back to the heart via pulmonary veins; systemic circulation covers the journey of oxygenated blood through the aorta to the upper body, digestive system, and lower body, and the return of deoxygenated blood via the portal vein, inferior vena cava, and liver back to the heart.
Given the complexity of the image, the above description may not be entirely accurate.
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The diagram above shows the functionalities of the blood circulation system.
The blood is differentiated by two types: the deoxygenated and oxygenated ones. The blood path starts from the heart which pumps from the upper body to the lower body of a person, going through the lungs, the digestive system (stomach and intestine) and the liver. The channels are differentiated from arteries and veins.
The most important part of the circulatory system is the link between the pulmonary and the systemic circulation; deoxygenated blood passes through the lungs to collect oxygen and goes into the heart to be pumped into the whole body. The liver and digestive system are linked with the portal vein which carry the blood without oxygen. The main vein that transports the oxygenated blood is the Aorta. At the end, the blood with no oxygen comes back to the heart where it will be pumped into the lungs.
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