Solubility is not to be confused with the ability to 'dissolve' a substance, because the solution might also occur because of a chemical reaction. For example, zinc 'dissolves' (with effervescence) in hydrochloric acid as a result of a chemical reaction releasing hydrogen gas in a displacement reaction.
All three kidney, liver and lungs purify the blood. The lungs help remove carbon dioxide, the kidneys remove water-soluble waste and the liver removes fat soluble wastes and many other impurities from the blood....ref:http://www.pharmainfo.net/answers/pharmaquestion/which-organ-purifies-blood.
For example, the heart pumps blood, the liver (which has more than 500 functions) helps get rid of bodily poisons and stores vitamins, and the brain interprets electrical signals and makes decisions about what to do. Different organs functioning together are termed systems (or sometimes, organ systems). For example, the respiratory system consists of the nose, pharynx, larynx, trachea, bronchi, and lungs.