A red blood cell would pass through the heart in the following order after receiving oxygen:
1. Left atrium: The oxygenated blood from the lungs enters the heart through the pulmonary veins and enters the left atrium.
2. Left ventricle: From the left atrium, the blood flows through the mitral valve into the left ventricle, which contracts to pump the blood out.
3. Aorta: The left ventricle pumps the oxygenated blood into the aorta, the largest artery in the body, which carries the blood to the rest of the body.
So, the order would be Left atrium, Left ventricle, and Aorta.