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Bio 2320, Ch 4
SLCC Anatomy, histology flashcards
| Question | Answer |
|---|---|
| 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 |
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npatter4
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