What is the correct order of blood flow through the heart?

The correct order of blood flow through the heart involves understanding the pathway that blood takes as it circulates through the heart and the lungs. Blood enters the heart through the right atrium, having returned from the body where it has delivered oxygen and collected carbon dioxide. From the right atrium, blood flows into the right ventricle. The right ventricle then pumps the blood to the lungs via the pulmonary arteries.

In the lungs, carbon dioxide is exchanged for oxygen, and the now oxygen-rich blood returns to the heart, entering the left atrium. The next step is for the blood to flow into the left ventricle, which then pumps it out to the rest of the body through the aorta.

Thus, the sequence of: right atrium, right ventricle, lungs, left atrium, left ventricle accurately reflects this process, making it the correct answer. Understanding this sequence is fundamental for grasping how the heart functions as part of the circulatory system, emphasizing the separation of oxygen-rich and oxygen-poor blood and the critical role of the lungs in oxygenating blood.