::Tissue (biology)


Tissue::cells    Tissues::plant    Called::walls    Which::vascular    Xylem::types    Phloem::water


Cross section of sclerenchyma fibers in plant ground tissue
Microscopic view of a histologic specimen of human lung tissue stained with hematoxylin and eosin.

In biology, tissue is a cellular organizational level intermediate between cells and a complete organ. A tissue is an ensemble of similar cells from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues.

The study of tissue is known as histology or, in connection with disease, histopathology. 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. In the last couple of decades, developments in electron microscopy, immunofluorescence, and the use of frozen tissue sections have enhanced the detail that can be observed in tissues. With these tools, the classical appearances of tissues can be examined in health and disease, enabling considerable refinement of medical diagnosis and prognosis.

Tissue (biology) sections
Intro   Animal tissues    Plant tissues    See also    References    External links   

PREVIOUS: IntroNEXT: Animal tissues