Biological tissue

Biological tissue is a group of biological cells that perform a similar
function. The study of tissues is known as histology, or, in connection with
disease, histopathology. The classical tools for studying the tissues are
the wax block, the tissue stain, and the optical microscope, though
developments in electron microscopy, immunofluorescence, and frozen sections
have all added to the sum of knowledge in the last couple of decades. With
these tools, the classical appearances of the tissues can be examined in
health and disease, enabling considerable refinement of clinical diagnosis
and prognosis.

There are four basic types of tissue in the body. These compose all the
organs, structures and other contents.

   * Epithelium - Lines, covers, protects, absorbs and secretes.
   * Connective tissue - As the name suggests, connective tissue holds
     everything together. Blood is considered a connective tissue.
   * Muscle tissue - Muscle cells contain contractile filaments that move
     past each other and change the size of the cell.
   * Nervous tissue

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