Diagram Of The Lungs And Heart. It is located between the lungs in the middle of the chest behind and slightly to the left of the breast bone. Pulmonary circulaton brings blood into contact with alveoli in the lungs for gas exchange this is the only.
The heart pumps enriched blood cells. Blue arrows show the path of oxygen poor blood. Exposure to the atmosphere and polluted air eventually gives rise to mottled patches which tint the lungs gray in color.
Into these come the vena cava bringing blood from all of the body.
Lung capillaries pulmonary artery aorta vein and vena cava diagram. This unidirectional flow of blood through the heart shows that mammals have a double circulatory system. Red arrows show the path of oxygen rich blood cells. The other vessels fuel the rest of the body.