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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“One must apply one’s reason to everything here, learning to obey, to shut up, to help, to be good, to give in, and I don’t know what else. I’m afraid I shall use up all my brains too quickly, and I haven’t got so very many. Then I shall not have any left for when the war is over.”
—Anne Frank (1929–1945)