BIOL 1202 Lecture Notes - Lecture 40: Loose Connective Tissue, Epithelium, Muscle Tissue
Document Summary
Animal form and function are correlated at all levels of organization. Physical laws, especially physics of exchanging materials with environment, limits range of animal forms. Entire plasma membrane is exposed to medium: multicellular organisms with a sac body plan. Body wall is only 2 cell-layers thick. Exchange in complex animals (see fig 40. 4: large, complex animals have highly folded or branched internal surfaces, this increases surface area, cell in these surfaces are specialized for exchanging materials. The basic scheme of organization involves cells organized into tissues organized into organs organized into organ systems. Tissue: composed of cells with similar structure and function or, non-cellular components made by the cells (i. e. , bone and cartilage). There are four general types of tissue (see 40. 5): epithelial, connective, muscle, nerve. Connective tissue: functions mainly to bind and support other tissues. Composed of sparsely packed cells scattered throughout an extracellular matrix. Includes the layer beneath the skin called the loose connective tissue,
