What are the ventricles in the heart?

The ventricles in the heart are indeed the lower chambers that play a crucial role in the circulatory system by pumping blood out of the heart. The right ventricle is responsible for sending deoxygenated blood to the lungs for oxygenation, while the left ventricle pumps oxygen-rich blood to the rest of the body. This function is essential for maintaining the flow of blood throughout the body and ensuring that tissues receive the oxygen and nutrients they need.

In contrast, the upper chambers of the heart, known as the atria, serve to receive blood returning to the heart. The chambers that are involved in receiving blood from the lungs are specifically the left atrium. Additionally, valves control the direction of blood flow within the heart but are not considered chambers. Thus, the role of the ventricles as the pumping chambers highlights their importance in facilitating effective blood circulation.