53. How many chambers do
the bird heart and the
mammalian heart have?
Concerning temperature
maintenance what is the
advantage of the double and
complete circulation of these
animals?

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The bird and mammalian hearts are
into four chambers:
atrium, right ventricle, atrium and
left .

Birds and mammals homeothermic,
i.e., they their body
temperature. four-chambered heart
and double circulation provide
supply of more blood to the
making possible a
metabolic rate (mainly
respiration rate). Part the energy
produced the cellular respiration
used to maintain body temperature.