BIOL 1202 Lecture Notes - Lecture 2: Loose Connective Tissue, Epithelium, Cell Membrane
30 Oct 2017
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Document Summary
Entire plasma membrane is exposed to medium. Large, complex animals have highly folded or branched internal surfaces. Cell in these surfaces are specialized for exchanging materials. Body wall is only 2 cell-layers thick. Animal form and function are correlated at all levels of organization. Physical laws, especially physics of exchanging materials with environment, limit range of animal forms. The basic scheme of organization involves cells organized into tissues organized into organs organized into organ systems. Composed of cells with similar structure and function. Non-cellular components made by the cells (i. e. , bone and cartilage). Membranes cover the body and line all body cavities. The main function of the epithelial tissue is to form a barrier and the cells are closely joined. The tissues are either nourished by diffusion from capillaries beneath it or is continuously lost and replaced by cell division. Functions mainly to bind and support other tissues; composed of sparsely packed cells scattered throughout an extracellular matrix.
