FrogsMammals and birds have four chamber hearts (composed of right atrium, right ventricle, left atrium and left ventricle), but frogs have only three chambers - two atriums and one ventricle. Generally speaking, the heart absorbs anoxic blood from the body, transports it to the lungs for oxygen, and pumps it throughout the body to provide oxygen for body organs. For humans, the four chamber heart stores oxygenated blood and deoxygenated blood in different chambers, but in the frog’s body, a ...