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As cells become specialized, they form groups of cells called tissues. A
definition of a tissue is a group of cells similar in appearance, function
and origin. There are four basic types of tissue epithelial, connective,
muscle and nervous tissue; they form the second level of organization in
the human body.
The study of tissues is known a histology and this is an important branch of medicine as histologists identify diseased tissue in the laboratories of hospitals. Histochemistry is a branch of histology that deals with the identification of chemical compounds in cells and tissues.
| Root 3 | Hist- | from a Greek word histos, meaning web. Here hist/o means the tissues of the body such as nervous tissue or connective tissue. |
| Combining form | Hist/o | tissue |
This ends Section 3.