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Article: Organ
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- Biology
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Organ
An organ is a structure composed of two to four types of tissues working to perform functions that are beyond the scope of an individual tissue type. A set of related organs working cooperatively toward the performance of even more complex functions constitutes an organ system.
Organs come in many different forms. The stomach, with its composition of
epithelium
,
connective tissue
, nervous tissue, and smooth muscle tissue, is a familiar example. Bones are organs; although they consist primarily of
osseous
tissue, bones have a vast supply of nervous tissue in their nerves, fibrous tissue lining their cavities, and muscle and epithelial tissue in their blood vessels. The skin ...