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Bio 2320, Ch 4

SLCC Anatomy, histology flashcards

What are the common characteristics of Epithelial Tissue? 1. Celularity - little ground substance, cells bound by cell junctions 2. Polarity - apical/basal surface 3. Attachment -- basement membrane 4. Avascularity --> nutrients obtained by diffusion or absorption. 5. Regeneration --> mitosis of stem cells
What are the common functions of Epithelial tissue? 1. physical protection 2. "gatekeepers" control permeability 3. Provide sensation --> large nerve supply 4. Produce specialized secretions (gland cells)
What is the basement membrane of an Epithelial cell and what is it composed of? Composition = 1. basal lamina: collagen fibers, protein and carbohydrates secreted by the basal surface of the epithelial cell. 2. reticular lamina = protein fibers and carbohydrates secretes by the connective tissue cells.
What is the function of the basement membrane of an epithelial tissue? 1. physical support, anchored to the conective tissue. 2. barrier - regulate movement of large molecules between epithelium and connective tissue.
What is a tight junction and its function? adjacent cell membranes are tightly bound at apical surface by interlocking membrane protiens (at lipid portions of membrane) Prevent passage of H2O and solutes between cells.
What is a desmosome and its function? CAM's and proteoglycons (protein fibers) link the opposing cell membranes--connected to cytoskeloton = really strong. hemidesmosomes = 1/2 desmosome that anchor cell to basal lamina
What is a Gap Junction and its function? two cells held together by a link of connexons (carrier proteins) allows a passage or pore to allow solutes and other nutrients to pass from cell to cell.
Simple Squamous Epithelium (structure, function, location) * this, flat, somewhat irregular --delicate * easy diffusion, osmois, or absorption/secretion * located in protected regions where diffusion/absorption takes place, alveoli, lining of ventral cavties, lining of heart and blood vessels.
Mesothelium: define Simple squamous epithelium that specifically lines the ventral body cavities: pleura, peritoneum, and pericardium
Endothelium: define simple squamous epithelium that specifically lines the inner surface of the heart and all the blood vessels. the lacunae of the vessels.
Simple Cuboidal Epithelium (Structure, function, location) * tall as wide, "hexagonal boxes"; distance between nuclei = height of cell. * limited protection, BUT good for secretion and absorption
Created by: npatter4