Dinosaurs Heat Regulation

Historically, dinosaurs were seen as reptilian-like creatures, that is, ones that regulated heat externally. However, recent discoveries point to the fact that at least some dinosaurs may have been endothermic. A new range of fossil discoveries from China show that a huge number of small theropod dinosaurs were blanketed in feathers (Sloan 98). Some paleontologists disagree with the “feather” find. Many argue that the feathers are in actuality merely folds thin transparent membranes, like the

. . .
ffes are double that of humans, allowing blood traveling to organs and extremities to carry more oxygen. This requires less pumping, but Giraffes still need bigger hearts than animals their size normally require. The Barosaurus, it was found, faces adaptive pressures common to Giraffes but to a much greater degree. As Choy notes: To pump blood 12 meters from the thorax to the top of the head, the heart of Barosaurus would need to achieve a systolic pressure of 12,000 millimeters of water, or about 880 millimeters Hg. Such an enormous pressure would require a very large and strong heart and very thick walls in the arterial system to prevent rupture. Indeed, zoologist Roger Seymour estimated the heart size of large Sauropods to have been more than 1.6 metric tons, or eight times that of a whale of similar size. (534) Because of the enormous size of the Barosaurus’ heart, it would beat very slowly. In addition to this, the length between the huge heart of the Barosaurus and its head would require a time span between heart beats for blood to be capable of falling back towards the dinosaur’s heart before it could beat again. It is possible, paleontologists speculate, that small “hearts” or pumps existed along the neck of th
. . .

Some common words found in the essay are:
Barrick Showers, According Berman, Pelycosaursit African, BODY Historically, Feathers Rex, Roger Seymour, INTRODUCTION Animals, Robert Bakker, Spinosaurus Researchers, Choy Altmann, temperature regulation, body temperature, ectotherm/endotherm debate, species dinosaurs, dinosaurs extinct, holden 1139, isotopic composition, systems dinosaurs, dinosaurs endothermic, temperature regulation system, isotopic composition body, endothermic temperature regulation, tyrannosaurus rex, regulated body temperature, composition body water,
Approximate Word count = 1870
Approximate Pages = 7 (250 words per page)