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The video tutorial explains the anatomy and function of the heart's atrium, focusing on the left atrium. It describes how the atrium receives oxygen-rich blood from the pulmonary veins and transports it to the left ventricle, eventually reaching the aorta for systemic circulation. The tutorial also covers the role of heart valves, particularly the mitral valve, in ensuring unidirectional blood flow. Additionally, it discusses the foramen ovale's function in fetal circulation and its potential health implications if it remains open after birth.

Explain the significance of the foramen ovale in fetal circulation.

What can happen if the foramen ovale remains open after childbirth?