At the time of Jesus and for centuries afterward, arteries and veins were thought to be filled with air and blood was viewed as something to be used up rather than recirculate. Bloodletting -- the practice of intentionally draining blood from a patient -- was common medical practice through the time of George Washington, hastening his death prematurely for reasons not understood until years later. | At the time of Jesus and for centuries afterward, arteries and veins were thought to be filled with air and blood was viewed as something to be used up rather than recirculate. Bloodletting -- the practice of intentionally draining blood from a patient -- was common medical practice through the time of George Washington, hastening his death prematurely for reasons not understood until years later. |