- Human pathology

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Friday 16 July 2004


Definition: In biology, an organ or a viscus is a collection of tissues joined in a structural unit to serve a common function ( see biological function ). In anatomy, a viscus is an internal organ, and viscera is the plural form. Functionally related organs often cooperate to form organ systems and physiological functions.

The organ systems are composed by organs.
Organs are composed by tissues.
Tissues are composed by cells.
Cells are composed by biomolecules.

A hollow organ is a visceral organ that forms a hollow tube or pouch, such as the stomach, intestine, or bladder.

72 to 76 organs have been scientifically validated in the human body: men have 72 organs, women have 76.

See also

- organ systems
- regions of the body