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Hale

Your heart is a beautifully designed pump whose purpose is to deliver blood, together with life-giving oxygen and nutrients, to every cell, tissue, and organ of your body. Shaped like a pear and weighing about eleven ounces, the heart sits in the center of the chest, pointing up toward the right shoulder. It is a specialized muscle divided into four chambers, two on the right and two on the left, which are separated by one-way valves. The heart therefore is in a sense two pumps, because it’s right and left sides are separated from each other.

There are four chambers in the heart, two–an atrium and a ventricle–on either side. The right atrium is a receptacle for the veins transporting blood back into the heart. When it has filled, the chamber’s muscle contracts and empties its contents through the tricuspid valve and into the right ventricle.

The right ventricle transports oxygen-depleted blood to the lungs across the pulmonary valve and into the pulmonary artery and its branches.
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