The five vital organs in the human body are the brain, heart, lungs, kidneys, and liver. Other organs include the gallbladder, pancreas, and stomach. Learn about the organs in the body. Get a diagram and list of human organs and discover their location and functions. What are the major organs and body parts in the human body? The human body has over 78 organs, but the most vital ones include the brain, heart, lungs, liver, and kidneys. Organs are structures inside your body that have specialized jobs. They include internal organs like your heart and brain, plus external ones like your skin. The body includes nine major organ systems, each composed of various organs and tissues that work together as a functional unit. The chief constituents and prime functions of each system are: The diagram of human organs shows this system, including organs such as the mouth, oesophagus, stomach, intestines (small and large), liver, gallbladder, and pancreas. Since there is no single standard definition of what constitutes an organ, the number of organs vary depending on how one defines an organ. For example, this list contains more than 78 organs (about ~91). The human body consists of many interacting systems of organs. These interact to maintain homeostasis, keeping the body in a stable state with safe levels of substances such as sugar and oxygen in the blood. Anatomical chart of organs by body system with cavity locations, plus how to read left/right, quadrants and labels on a printed chart or model. Explore 25 major human body organs with their locations and functions. This clear guide makes anatomy easy to understand and remember.