The two lower chambers are called the

The two lower chambers are called the

• A. ventricles
• B. atria
• C. valves
• D. septum

Answer: (A)

The two lower chambers are the ventricles—the pumping chambers of the heart. The right ventricle sends blood to the lungs, while the left ventricle sends blood to the rest of the body. The upper chambers are the atria, and valves regulate flow between chambers and out of the heart. The septum divides the heart into left and right sides. In an EKG, ventricular activity shows up as the QRS complex, highlighting the importance of these pumping chambers in rhythm interpretation.