Secrets of the 4 chambers revealed by reptile hearts

Wednesday, September 2, 2009 - 18:21 in Biology & Nature

The first genetic link in the evolution of the heart from three-chambered to four-chambered has been found, illuminating part of the puzzle of how birds and mammals became warm-blooded. Frogs have a three-chambered heart. It consists of two atria and one ventricle.

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