The human body is made up of complex organ systems, each with distinct functions and impressive sizes. The liver is one of the heaviest internal organs and plays a central role in metabolism, detoxification, and nutrient processing. The lungs are responsible for oxygen exchange and expand significantly during breathing, occupying much of the chest cavity. The intestines—including both the small and large intestine—stretch over 20 feet in length and are vital for digestion and nutrient absorption. Then there’s the skin, which serves as a protective barrier against environmental hazards, helps regulate body temperature, and enables the sensation of touch. While each organ serves a unique purpose, they all contribute to your body’s ability to function and adapt to daily demands. Learning about their roles and characteristics helps deepen your appreciation for the incredible efficiency and design of the human body.