What is the different between the frogs and a humans heart?
First, the frog heart (amphibian) has a three chambered heart,
two atria and one ventricle. The ventricle is not fully separated;
it's partly separated by the conus arteriosus. The blood, however,
stays mostly unmixed. The ventricles delivers oxygenated (efferent)
blood to the systemic and pulmocutaneous arteries. The human heart
has four chambers, and its two ventricle are fully separated. The
fresh efferent blood from the lungs goes to the systemic aorta.