Which sequence represents the correct flow of blood through the heart starting from the right atrium?

The flow of blood through the heart begins in the right atrium, where deoxygenated blood from the body collects. The correct sequence involves the movement of blood from the right atrium through the tricuspid valve into the right ventricle. The tricuspid valve acts as a one-way gate that prevents backflow into the atrium when the ventricle contracts, ensuring blood proceeds efficiently to the next chamber.

After filling the right ventricle, blood is then pumped into the pulmonary artery, which carries it to the lungs for oxygenation. This step is crucial, as the right ventricle plays a key role in sending blood away from the heart towards the lungs. The other options either skip the right ventricle or describe incorrect pathways, making them unsuitable as representations of the correct flow of blood starting from the right atrium.