Tissue
A tissue in medicine is not like a piece of tissue paper.
It is a broad term that is applied to any group of cells that perform specific functions.
A tissue in medicine need not form a layer.
Thus,</P> > >The bone marrow is a tissue; >Connective tissue consists of cells that make up fibers in the framework supporting other body tissues; and >Lymphoid tissue is the part of the body's immune system that helps protect it from bacteria and other foreign entities.</LI></UL>