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You've gotta have heart
Natural History, Oct, 2005 by Jordon Hirshon, John Ruben
All endothermic vertebrates (mammals and birds) have four-chambered hearts, to satisfy the high oxygen demand imposed by maintaining a high body temperature. After reading the responses by John A. Ruben, Willem J. Hillenius, and Mary Higby Schweitzer to the question, "Were Dinosaurs 'Cold-' or 'Warmblooded'" [5/05], I wondered, is there any evidence that dinosaurs had four-chambered hearts?
Jordon Hirshon
Long Island University
Brooklyn, New York
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JOHN RUBEN REPLIES: No reliable, direct evidence exists for the number of chambers (three or four) in dinosaurs' hearts. Nevertheless, given that living birds and crocodilians both have four-chambered hearts, it is reasonable to infer that dinosaurs did, too.
COPYRIGHT 2005 Natural History Magazine, Inc.
COPYRIGHT 2008 Gale, Cengage Learning
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