The heart of a Brachiosaurus

[GGreyOwl@aol.com]

Hi, everyone. I'm a new subscriber to the list with an important question ( at
least it's important to my dinosaur-loving 9-year old [I think he wants to be
a cardiologist!]). 

Julian wants to know how big was the heart of a Brachiosaurus. It must have
been huge to pump blood all the way up to its head. And/or was its blood
pressure really high? Does anybody have any thoughts, theories, or pertinent
facts on this vascular question?

Thanks.