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In biology and anatomy, an organ (Latin: organum, "instrument, tool", from Greek ὄργανον - organon, "organ, instrument, tool"[1]) is a collection of tissues joined in structural unit to serve a common function.[2]




Organ systems


Plant organs and organ systems

The flower is the angiosperm's reproductive organ. This Hibiscus flower is hermaphroditic, and it contains stamens and pistils.
Strobilus of Equisetum.


The vegetative organs are essential for maintaining the life of a plant (they perform the vital functions, such as photosynthesis), while the reproductive organs are essential in reproduction. However, if there is asexual vegetative reproduction, the vegetative organs are those that create the new generation of plants (see clonal colony).


Animal organs and organ systems



List of major human organ systems

There are typically considered to be eleven major organ systems of the human body. Humans have a variety of systems due to the complexity of the species' organism. These specific systems are widely studied in Human anatomy. "Human" systems are also present in many animals.

See also


  2. ^ Widmaier EP, Raff H, and Strang KT (2003) Vander's Human Physiology. 11th Ed. McGraw-Hill. ISBN 987-0-07-304962-5.
  3. ^ > hollow organ Citing: Merriam-Webster's Medical Dictionary, 2002

External links


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