Internal organs are the organs located within the body, such as the heart, lungs, and liver. INNARDS, VISCERA, INSIDES, and VITALS are all terms used to refer to these organs. INNARDS is a term used to describe the internal organs collectively, while VISCERA refers to the organs of the digestive system. VITALS is a term used to refer to the organs that are essential for life, such as the heart and lungs. INSIDES is another term used to refer to the internal organs collectively.