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Human Biology Assignment One Tissues by Victoria Jackson Tissues are defined as a group of associated, similarly structured cells that with their ground substance act together in the performance of a specialised function for the survival of the multicellular organism. The tissues are classified into four main groups which are epithelial, connective, muscle and nervous. (http://encarta.msn.com/encyclopedia accessed 08 October 2004) Epithelial Tissues Epithelial tissues form the covering of all body surfaces with the functions being to provide protective covering, absorption, secretion, diffusion, sensation and contractility. They are tightly packed together with little intercellular matrix and can be squamous (flattened or scale like), cuboidal (cube), or columnar (cylindrical or column like) in shape and may be arranged in single or multiple layers. I have chosen to look more into Ciliated Columnar Epithelium; This is a tall column like cell with a nucleus at the bottom near the basement membrane, with cilia and lots of cytoplasm above the nucleus....

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