Fetal circulation: The most oxygenated blood in the right atrium is shunted through the ________________ (this is an opening between the right and left atria) into the left atrium. The blood then enters the left ventricle and is pumped out to the head and the rest of the body.

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1. Fetal circulation: The most oxygenated blood in the right atrium is shunted through the ________________ (this is an opening between the right and left atria) into the left atrium. The blood then enters the left ventricle and is pumped out to the head and the rest of the body.