You can see example of these two circuits in Figure 23.2B (Notice that the right side of the animal's heart is on the left in the diagram. It is customary to draw the system as through in a body facing you from the page.) Frogs and other amphibians have three - chambered heart.The right atrium receives blood return ing from the systemic capillaries in the body's organs. The ventricle pumps blood to capillary beds in the lungs and skin.