Final answer:
The true statement about how blood flows through the heart is option C, which describes the pathway from the right atrium to the right ventricle, to the pulmonary artery, the lungs, the left atrium, the left ventricle, and finally to the aorta.
Step-by-step explanation:
The correct sequence of blood flow through the heart is represented by option C: RA to RV to Pulmonary Artery to LA to LV to Aorta. Blood flows from the right atrium (RA) to the right ventricle (RV). From the RV, the pulmonary valve allows blood to flow to the pulmonary artery, which leads to the lungs where gas exchange occurs. Oxygen-rich blood returns to the heart via the left atrium (LA) from the pulmonary veins. Blood then flows from the LA to the left ventricle (LV) through the open mitral valve. Finally, blood is pumped from the LV through the aortic valve into the aorta, supplying the body's systemic circulation.
A comprehensive sequence of the circulation would involve arteries carrying blood away from the heart, starting with the aorta, followed by the exchange of substances in capillaries, and returning to the heart via venules and veins. The blood ultimately returns to the heart into the right atrium through the superior vena cava and inferior vena cava.