One of Galen's medical breakthroughs was proving arteries carried blood & not this, as was believed
He posited that arterial blood originated in the heart, from where it 
was... [DOC] [TLE] GCSE History wiki - Galen - Wikispaces [PAR] Galen was the great compiler and systemiser of Greco-Roman medicine, ... With 
the use of experiment Galen showed that the arteries carried blood and not air as 
... One of the main things Galen did which was wrong was his theories on the ... it 
was not entirely his fault that his ideas were believed for so long, because the... [DOC] [TLE] BBC - History - Historic Figures: Galen (c.130 AD - c.210 AD) [PAR] His most important discovery was that arteries carry blood although he did not ... 
and Roman medical thought to date, and added his own discoveries and theories
.