What is the sequence of blood flow from the periphery to the lungs?

The correct sequence of blood flow from the periphery to the lungs begins with the superior and inferior venae cavae, which are large veins that carry deoxygenated blood back to the right atrium of the heart from the body's tissues. Once the blood enters the right atrium, it is then pushed through the tricuspid valve into the right ventricle.

From the right ventricle, this deoxygenated blood is pumped into the pulmonary arteries, which carry it to the lungs for oxygenation. This flow sequence is vital for ensuring that blood receives oxygen in the lungs and returns to the heart for distribution to the rest of the body. Understanding this pathway is critical in physiology as it outlines the key role of the heart and the circulatory system in maintaining effective gas exchange and providing oxygen to tissues throughout the body.