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.

Sept 15 (Reuters) - Scientists in Australia have unearthed beautifully preserved fossilized hearts and other internal organs of ancient armored fish in a discovery that provides insight into the ...

Humans and other mammals share anatomical structures, such as the four-chambered heart, lungs, hair (or fur), skeleton, and milk-producing mammary glands.

Humans and other mammals share anatomical structures, such as the four-chambered heart, lungs, hair (or fur), skeleton, and milk-producing mammary glands.

Courtesy of Chrissa Kioussi Like ants marching to an unspoken command, embryonic heart cells follow distinct orders for organ formation, according to a group at the Pasteur Institute. Although many ...

Its structure differs from later vertebrates. Amphibians and reptiles have a three-chambered heart, while mammals and birds have a four-chambered heart.