Vital organs are essential for the functioning of the human body. The HEART, LIVER, and lungs are three of the most important vital organs. The HEART is a five-letter word, which pumps blood throughout the body. The LIVER is also a five-letter word, which helps to filter toxins from the body. The lungs are a four-letter word, which are responsible for taking in oxygen and expelling carbon dioxide. All three of these vital organs are essential for life and must be kept healthy in order to maintain good health.