Why does your heart have two halves?

Answer 1

Two halves make whole :)

Technically your heart has 4 chambers, so 4 quarters. Answer

It is because your heart is two pumps in one package.

The right side of the heart, which contains an atrium and a ventricle, pumps oxygen-depleted blood to the lungs for oxygenation, through the pulmonary artery. That artery is the only artery in the body that carries venous or "blue" blood. The left side of the heart, which contains a separate atrium-ventricle unit, pumps oxygenated blood ("scarlet" blood) out to the various parts of the body.

Answer 2

The right side of your heart receives blood from the body and pumps it to the lungs. The left side of the heart does the exact opposite: It receives blood from the lungs and pumps it out to the body. Each side has a different function this is why they are divided. This is why the heart is divided into left and right. Because we need both the different things that each side does.