Q. How many chambers do the mammalian heart and the bird heart have? Concerning temperature maintenance what is the benefit of the double and complete circulation of these animals?
The bird and the mammalian hearts are divided into four chambers: right atrium, left atrium and left ventricle, right ventricle.
Birds and mammals are homeothermic, that is they control their body temperature. The four-chambered heart and the double circulation provide the supply of more oxygenated blood to the tissues making possible a higher metabolic rate mainly cellular respiration rate. Part of the energy produced by the cellular respiration is used to sustain the body temperature.