Internal organs are the vital structures inside the body that perform essential functions for survival. These organs include the heart, lungs, liver, kidneys, and stomach, among others. Each organ has a specific role, such as pumping blood, breathing, filtering waste, and digesting food. The internal organs are protected by the rib cage and abdominal wall. They work together in systems, like the circulatory system and digestive system, to maintain the body's overall health. Proper functioning of these organs is crucial, as any dysfunction can lead to serious health issues.