Final answer:
The pumping chambers of the heart are the ventricles, located in the lower portion of the heart. The right ventricle pumps blood into the pulmonary circuit, while the left ventricle pumps blood into the systemic circuit.
Step-by-step explanation:
The pumping chambers of the heart are located in the lower portion of the heart and are called the ventricles. There are two ventricles: the right ventricle and the left ventricle. The right ventricle pumps blood into the pulmonary circuit and the left ventricle pumps blood into the systemic circuit.