In the context of heart anatomy, a septum is a wall or partition that divides the heart into chambers, such as the left and right sides. This structure is critical in ensuring that oxygen-rich blood is kept separate from oxygen-poor blood.
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The lower chambers of the heart responsible for pumping blood out to the lungs and rest of the body.
Pulmonary circulation: The path of blood flow from the right side of the heart through to the lungs to receive oxygen and back to the left side of the heart