Final answer:
Venous blood entering the right atrium from the body passes through the tricuspid valve (option D). The blood then flows through the heart's chambers and valves following a path that exemplifies the mammalian double circulation pattern. The mitral valve is another critical valve encountered by the blood after oxygenation in the lungs.
Step-by-step explanation:
When venous blood returns to the heart from the body, it enters the right atrium and passes through the tricuspid valve. After the blood moves through the tricuspid valve, it enters the right ventricle and is subsequently pumped through the pulmonic valve into the pulmonary artery, carrying the blood to the lungs for gas exchange in the pulmonary circulation.
Upon returning from the lungs, oxygen-rich blood enters the left atrium and then flows through the mitral valve, also known as the bicuspid valve, into the left ventricle, from where it is pumped out of the heart through the aortic semilunar valve and into the systemic circulation. This flow of blood through the heart valves demonstrates a double circulation pattern that is characteristic of the mammalian cardiovascular system.