Heart functions

The heart has the function of circulating blood though two circuits, the pulmonary circuit and the systemic circuit, which supplies nutrients, oxygen and other necessary elements to other parts of the body.

- In the pulmonary circuit, the deoxygenated blood leaves out of the right ventricle of the heart into the pulmonary artery that then travels to the lungs after it goes in it becomes oxygenated and this blood returns to the heart via de pulmonary vein and then the left atrium.

- In the systemic circuit, the now oxygenated blood leaves the heart though the left ventricle to the aorta, and enters the arteries and capillaries so that it can supply the body and its tissue with oxygen and other nutrients. The deoxygenated blood then returns via veins, though the vena cava and finally re-entering the heart's right atrium.

Reference

Lewis, D. (2016). Human Heart: Anatomy, Function & Facts. [Web portal]. Retrieved from http://www.livescience.com/34655-human-heart.html