Tissue (biology)
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In biology, tissue is a biological organizational level between cells and a complete organ. A
tissue is an ensemble of similar cells and their extracellular matrix from the same origin that
together carry out a specific function. Organs are then formed by the functional grouping
The English word "tissue" derives from the French word "tissu", the past participle of the verb
tisser, "to weave".
The study of tissues is known as histology or, in connection with disease, as histopathology.
Xavier Bichat is considered as the "Father of Histology". Plant histology is studied in both plant
anatomy and physiology. The classical tools for studying tissues are the paraffin block in which
tissue is embedded and then sectioned, the histological stain, and the optical microscope.
Developments in electron microscopy, immunofluorescence, and the use of frozen tissue
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