Category A - full version without watermark 720x576 (check terms and conditions at www.teledesign.de) The embed version with watermark is free of charge. - Description: After having been metabolized to their smallest building bricks, nutrients travel from the intestine through the so called portal venous system to the liver. It decomposes toxic substances and excretes water soluble toxins through the kidneys; fat soluble toxins are transferred to the bile. From there the waste products leave the body with the stool. The lungs contribute to detoxification as well: they release carbon dioxide during exhalation.