Right atrium
Have been on the venous blood coming from the pipe. Which receives blood from the upper body. And the venous tube Receives blood from the lower body. This relatively thin walls of the heart. Of particular importance is attached to the left atrium. Have indentations, called Fossa ovale, which is the link between the two atria.
Right ventricles
Is on the front of the heart. And the rear surface of the heart is attached to the diaphragm. Right ventricle receives blood from the right atrium. And then sent out to the lungs Through the pulmonary valve and the pulmonary arteries.