Tissues : The living fabric Chapter 4. Histology = the study of tissues Tissues : groups of cells which are similar in structure and which perform common or related functions. Four Basic Kinds of Tissues. Epithelial Tissue (protection) Connective Tissue (support)
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Classification of epithelial shapes:
Classification of epithelial layers present:
Goblet cells = specialized cells within some epithelial tissues that secrete mucus (example: epithelium lining the digestive and respiratory tracts)
Cilia = hair-like extensions from the cell that beat back and forth uniformly to move mucus along the surface of the epithelium
Microvilli = finger like cell projections that cover the surface of small intestinal epithelium and function to increase surface area for absorption
– unstructured material that fills the space between cells and contains fibers
foreign matter (immune
system) and dead tissue
Loose connective tissues
dense connective tissues
Function: body protection (phagocytic); fibers support other cell types
Function: transport of respiratory gases, nutrients, wastes
ie., brain, spinal cord & nerves.
When tissue injury occurs, it stimulates the body’s inflammatory and immune responses.
Occurs in two ways:
Organization – the process during which the temporary blood clot is replaced by the ingrowth of granulation tissue