Medical Sciences 3999A/B/Y Lecture Notes - Lecture 7: Basal Lamina, Tight Junction, Cell Adhesion Molecule
2 Feb 2020
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Document Summary
Body tissues can be classified into 4 basic types: Epithelial tissue: covers body surfaces and lines hollow organs, body cavities, and ducts. It is composed of closely aggregated cells with very little extracellular substance. Connective tissue: protects and supports the body and its organs. Various types bind organs, store energy and fat, and help provide immunity from pathogens. It is characterized by abundance of ecm and is found along with every other tissue type. Muscle tissue: generates physical force needed to make the body structures move; composed of elongated cells that have specialized function of contraction. Nervous tissue: detects changes in variety of conditions inside and outside the body, and responds by generating nerve impulses, and maintain homeostasis. Epithelial tissues arise from all three primary germ layers, whereas connective tissues and muscles arise from the mesoderm, and the nervous tissue arise from the ectoderm and endoderm. Line and cover all body surfaces (except articular cartilage and tooth enamel)
