IF THE BEATING HEART is pure theater, a playful, moody, extroverted organ cavorting in the chest, then the liver, sitting under the diaphragm, is a figurative painting, stolid and silent. The liver produces bile, without which fats are not digested, and the liver stores excess glucose in the form of glycogen. In silence and without outward signs, it detoxifies drugs and chemicals, it manufactures proteins for clotting and for transport, and it clears the body of ammonia, a waste product of metabolism.
