Organ (anatomy)

Organ (anatomy)

An organ (/ˈɔːrɡən/; from Ancient Greek ὄργανον, organon, "instrument, tool") is a group of tissues with similar functions. Plant life and animal life rely on many organs that coexist in organ systems.

Etymology

The word "organ" comes from the Old French organe, which originated from the Latin organum, a term used to describe a musical instrument or "organ of the body". This in turn comes from the Greek "ὄργανον" (organon), which refers to a tool or instrument, musical instrument, and organ.

Definition

A larger outgrowth, the organ, is formed from the tissues, and it performs a specific function. This function is vital for the body's survival. A hollow organ is an internal organ that forms a hollow tube, or pouch such as the stomach, intestine, or heart.

Types of organs

In the study of anatomy, organs are classified in various ways. One popular classification is based on whether or not they are vital to survival. Examples of vital organs, which are needed for survival, include the heart, lungs, brain, and liver. On the other hand, non-vital organs—such as the appendix, spleen, and gallbladder—do not affect survival if removed. Organs can also be classified based on their complexity. A simple organ is one with a very basic structure, like the appendix, while a complex organ is one with a more intricate structure, like the heart.

Related terms

• Organ system: A group of organs that work together to perform a certain task.
• Tissue (biology): An ensemble of similar cells from the same origin that together carry out a specific function.
• Cell (biology): The basic structural, functional, and biological unit of all known organisms.

See also

• List of organs of the human body
• Organ transplantation
• Organ donation

External links

• Medical encyclopedia article on Organ (anatomy)
• Wikipedia's article - Organ (anatomy)

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