Tuesday, February 21, 2012

Scientists Unlock Evolutionary Secret of Blood Vessels

ScienceDaily (Feb. 21, 2012) — The ability to form closed systems of blood vessels is one of the hallmarks of vertebrate development. Without it, humans would be closer to invertebrates (think mollusks) in design, where blood simply washes through an open system to nourish internal organs. But vertebrates evolved closed circulation systems designed to more effectively carry blood to organs and tissues.
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