The left atrium is one of the four chambers in the human heart. It receives oxygenated blood from the pulmonary veins, and pumps it into the left ventricle, via the mitral valve. Atria facilitate circulation primarily by allowing uninterrupted venous flow to the heart, preventing the inertia of interrupted venous flow that would otherwise occur at each ventricular systole.
Read more about Left Atrium: Size, Foramen Ovale, Blood Supply, Animals
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“The only freedom supposed to be left to the masses is that of grazing on the ration of simulacra the system distributes to each individual.”
—Michel de Certeau (1925–1986)