Which side of the heart is responsible for replacing carbon dioxide with oxygen?

The left side of the heart is responsible for pumping oxygen-rich blood to the body, while the right side is tasked with receiving deoxygenated blood and sending it to the lungs for gas exchange. This is where carbon dioxide is replaced with oxygen.

Blood that returns to the right side of the heart from the body is low in oxygen and high in carbon dioxide. Once it enters the right atrium, it flows into the right ventricle, which then pumps it to the lungs through the pulmonary arteries. In the lungs, carbon dioxide is expelled from the blood, and oxygen is absorbed. The now oxygenated blood returns to the left side of the heart to be distributed throughout the body. Therefore, the right side plays a crucial role in this process of replacing carbon dioxide with oxygen through its connection to the lungs.