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

The correct sequence of blood flow through the heart is accurately represented in the option where blood flows from the organs to the right atrium, then to the right ventricle, followed by the lungs, then to the left atrium, and finally into the left ventricle before being pumped out to the organs again.

This sequence adheres to the anatomical and physiological pathways of the heart. Blood that has circulated through the body, delivering oxygen and nutrients to tissues, returns to the heart via the superior and inferior vena cavae into the right atrium. From the right atrium, blood moves into the right ventricle, which then pumps it through the pulmonary arteries to the lungs for oxygenation.

Once oxygen-rich blood returns from the lungs via the pulmonary veins, it enters the left atrium, moves into the left ventricle, and is then pumped out through the aorta to supply the rest of the body with oxygenated blood. This complete cycle illustrates the heart's role in systemic and pulmonary circulation, showcasing how efficiently it manages the transport of blood throughout the body. Understanding this pathway is crucial for grasping the fundamentals of cardiovascular physiology.