Venous blood from the systemic circulation enters the right atrium. The blood moves from the right atrium into the right ventricle of the heart, which pumps blood through the pulmonary circuit eventually filling the left atrium.
Aortic semilunar valve Identify the structure found in a fetus that allows blood to flow directly from the pulmonary trunk into the aorta. Ductus arteriosus Why is the myocardium of the left ventricle thicker than the myocardium of the right ventricle?
Pulmonary semilunar valve Explain how the heart pumps blood into two separate closed circuits that are arranged in series. The two circuits are the pulmonary and systemic circuits. Venous blood from the systemic circulation enters the right atrium.
The two circuits are the pulmonary and systemic circuits. Venous blood from the systemic circulation enters the right atrium. The blood moves from the right atrium into the right ventricle of the heart, which pumps blood through the pulmonary circuit eventually filling the left atrium.