What is the definition of a ventricle in the context of the heart?

In the context of the heart, the term "ventricle" specifically refers to one of the two lower chambers of the heart that are responsible for pumping blood. The right ventricle pumps deoxygenated blood to the lungs for oxygenation, while the left ventricle pumps oxygenated blood to the rest of the body. This definition is crucial as it distinguishes the ventricles from the atria, which are the upper chambers of the heart responsible for receiving blood. Recognizing the role and location of the ventricles within the heart's anatomy is essential for understanding cardiovascular function and pathology. The other choices focus on different aspects of the heart's structure or function, but they do not accurately describe what the ventricles are.