Organes

An organ is a distinct anatomical structure composed of multiple tissue types that cooperate to perform one or more specific functions. In multicellular organisms, organs are organized into organ systems, such as the circulatory or digestive systems. The tissues that form an organ—epithelial, connective, muscle, and nervous tissue—work together to support the organ’s activities. Organs require blood supply and neural input to function effectively.

Common human organs and their primary roles include the heart (pumping blood), lungs (gas exchange), liver (metabolism and detoxification), kidneys (filtration and excretion), brain (control center of the nervous system), stomach and intestines (digestion and nutrient absorption), and skin (protection and temperature regulation). Some organs perform several tasks across systems, such as the pancreas which participates in digestion and hormone regulation.

In development, organs form through organogenesis, a process of tissue growth and differentiation driven by genetic and environmental factors. Organ structure and function vary across species, reflecting evolutionary adaptation. In health sciences, the study of organs—anatomy and physiology—helps diagnose disease, understand bodily regulation, and guide medical treatments, including organ replacement or transplantation when organ function is severely compromised.