Blood returns to the heart through the veins. The circulatory system is responsible for transporting blood throughout the body, and veins are the vessels that carry deoxygenated blood back to the heart after it has delivered oxygen and nutrients to the tissues.
Once the oxygen has been used up by the body’s cells, the blood becomes deoxygenated and travels through the venous system. The major veins include the superior vena cava, which brings blood from the upper body, and the inferior vena cava, which collects blood from the lower body. These large veins empty into the right atrium of the heart.
From the right atrium, the blood flows through the tricuspid valve into the right ventricle, and then it is pumped to the lungs for re-oxygenation. This process is crucial for maintaining the body’s oxygen supply and ensuring that metabolic waste is removed efficiently.