Medicine: The Second Circulation

For once, the Greeks had no word for it: they neither understood nor named the body's system of glands and connecting channels through which colorless fluids flow. The Romans did coin a name, but for the fluid only. They called it lympha, after a fancied resemblance to clear spring water. But nothing about the lymphatic system was clear then, or for another 2,000 years. Only now, says Tulane University's Physiologist Hymen S. Mayerson in a report to the American College of Surgeons, are the workings of the lymphatic system beginning to be understood. The body's second circulation system, he says, plays...

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