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Re: Sauropod Energetics (Peristaltic pumps for arteries?)



The problem of high blood pressure is a major problem for those who believe that sauropods could elevate their head at heights far greater than their heart. Could their carotid arteries have evolved into peristaltic pumps? For those of you who don't know what peristalsis is, its the process that moves food and liquid through your esophagus and intestines. Arterial walls have a layer of smooth muscle tissue that may have evolved to work as peristaltic pumps to push blood to the brain. If this was the case, wouldn't it allow sauropods to have highly elevated necks without the need for extremely high blood pressure?

From: Guy Leahy <xrciseguy@sbcglobal.net>

One potential problem with rearing up (primarily in
diplodocoids and Mamenchisaurus)is the extremely large
heart-head vertical distances might be physiolgically
constrained by difficulties in producing sufficient
blood pressure to reach the head, as disussed in the
article below:

http://www.journals.royalsoc.ac.uk/media/1lbfddakxn3xwhe1fl1y/contributions/k/b/b/w/kbbwl6ee805dk8vx.pdf

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