Cell is the basic structural and functional unit of an organism. In unicellular organisms, a single cell performs all the functions but in large or multicellular organisms various cells are specialized to perform special functions. A group of such cells which may be structurally dissimilar but are always similar in origin are termed as tissue. The term animal tissue was coined by Bichat.
Epi means Upon and Thelio means grow. A biologytissue that grows upon another tissue is called epithelial tissue. Their basic function is to line, cover and protect other organs. They are characterized by cells tightly junked together. They can form single or multi layer of cells. The innermost cells always lie on a cell secretion membrane called as basement membrane. The free surface of these cells is sometimes lined by hair called cilia or microvilli. Based on number of layer of cells these are of 2 types: simple and compound epithelial tissues. They are further divided on the basis of 1. Cell shape and 2. Stretching ability.
Based on cell shape they are divided into 3 types.
Based on stretching ability they are of 2 types
These are widely spread cells in a matrix produced by these cells. The cell matrix is composed of 2 regions: Ground – i.e. liquid, gum like and Fibers – elastic and non elastic fibers. Their major function is support and protection. They are of 6 types
These are cells specialized for contraction. They contain fibers. They are of 3 types:
They consist of neurons or specialized cells that transmit impulses and responds to various stimuli.
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