Epithelial tissue is dominated by cohesive sheets of cells bound by specialized junctions such as tight junctions, desmosomes, and gap junctions, which create a formidable barrier. While epithelial tissue forms the continuous lining of our organs and outer surface, acting as a selective barrier, granulation tissue is a dynamic, provisional matrix that springs into action to seal wounds.
Epithelial Tissue Barrier Protection Absorption Secretion
It is avascular, meaning it lacks its own blood supply, and relies on diffusion from underlying connective tissue for nutrients. The surfaces of epithelial tissue can be classified by shape—squamous, cuboidal, or columnar—and by the number of layers, being either simple or stratified.
Defining Epithelial Tissue: The Body's Lining and Barrier Epithelial tissue, or epithelium, serves as the body's primary covering and internal lining, creating a selective barrier between the external environment and internal organs. Key Cellular and Molecular Differences The cellular makeup of these two tissues is fundamentally different.
Epithelial Tissue Barrier Protection Absorption Secretion
Granulation tissue, however, is purely a repair mechanism. Visual Identification Under the Microscope Distinguishing these tissues histologically is a core skill in pathology.
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