Final answer:
Blood flows through the heart in two separate loops: the right side loop and the left side loop. The right side collects oxygen-poor blood from the body and pumps it to the lungs, while the left side carries oxygen-rich blood from the lungs to the rest of the body.
Step-by-step explanation:
Blood flows through the heart in two separate loops. The right side of the heart collects oxygen-poor blood from the body and pumps it into the lungs, where it releases carbon dioxide and picks up oxygen. The left side carries the oxygen-rich blood back from the lungs into the left side of the heart, which then pumps the oxygen-rich blood to the rest of the body. The blood delivers oxygen to the cells of the body, where it is needed for cellular respiration, and returns to the heart oxygen-poor.