Once your blood has delivered oxygen and food to your cells, it returns to the upper chamber on the right side of your heart.

From there it moves into the lower chamber on the right. Next, it travels to your lungs through the pulmonary artery. That artery is a short, wide blood vessel that stretches between your heart and your lungs. There, it picks up oxygen.

Once blood has picked up oxygen, it returns to the left side of your heart through your pulmonary veins. These veins are four large blood vessels that bring blood back from your lungs to your heart.

Blood enters the upper chamber on the left side. Then it moves into the lower chamber on the left. It's then pumped through the main artery of your body (called the aorta) to all parts of your body.

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