Organ

An organ is a body structure composed of multiple tissue types that work together to perform one or more functions.

Tissue (biology): A group of similar cells and their surrounding material that performs a shared function. Organs combine distinct tissues into a larger functional structure.
Organogenesis: The developmental process by which organs form and acquire their structures. It explains how tissues become organized into functional organs.
Organ transplantation: The transfer of an organ from a donor to a recipient to replace a failing organ. Transplantation can restore function when an organ is irreversibly damaged.
Organism: An individual living entity, such as an animal, plant, fungus, or bacterium. An organ is one structural level within a multicellular organism.
Cell (biology): The smallest living unit, capable of carrying out the processes needed for life. Cells form the tissues that make up organs.
Organ physiology: The study of how organs function and interact with the rest of the body. It connects an organ's structure to the work it performs.
Organ failure: The loss of an organ's ability to perform essential functions adequately. It shows the consequences of an organ's functions falling below the body's needs.
Organelle: A specialized structure within a cell that performs a particular function. Despite the similar name, an organelle is cellular, while an organ is made of tissues.
Extracellular matrix: Material outside cells that provides structural support and biochemical signals in tissues. Its composition helps give an organ's tissues their shape and mechanical properties.
Homeostasis: The regulation of internal conditions within ranges compatible with life. Many organs maintain stable conditions by sensing and adjusting bodily variables.

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