The Tissue Level of Organization
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Created by:
ABengtson22 on December 5, 2010
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13 terms
Terms | Definitions |
|---|---|
 Simple Epithelium | Necessarily thin; all have same polarity; distance from the nucleus to tha basal lamina does not change from one cell to the next; very fragile; located only in protected areas of the body; line ventral body cavities, the heart chambers and blood vessels; located in regions where absorption and secretion occur; lining of intestines and gas exchange surfaces of lungs |
| Stratified Epithelium | Several layers of cells cover the basal lamina; usually located in areas that need protection from mechanical or chemical stresses; surface of skin and lining of mouth |
| Squamous Epithelium | Thin, flat and somewhat irregular in shape; like pieces of a jigsaw puzzle; resemble fried eggs laid side by side. |
| Simple Squamous Epithelium | Most delicate type; located in protected regions where absorption or diffusion takes place; lines respiratory exchange surfaces. |
| Mesothelium | Simple Squamous Epithelium that lines the ventral body cavities |
| Endothelium | Simple Squamous Epithelium lining the inner surface of the heart and all blood vessels. |
| Stratified Squamous Epithelium | Generally located where mechanical stresses are severe; cells form a series of layers; surface of skin and lining of the mouth, esophagus, and anus are areas where this type protects against physical and chemical attacks. |
| Simple Cuboidal Epithelia | Resemble hexagonal boxes; located in glands, ducts, portions of kidney tubules; thyroid glands; provides limited protection, secretion and absorption |
| Stratified Cuboidal Epithelium | located in the lining of some ducts of sweat glands and in larger ducts of mammary glands |
| Transitional Epithelium | Located in urinary bladder, renal pelvis and ureters; permits expansion and recoil after stretching |
| Simple Columnar Epithelium | located in lining of stomach, intestines, gallbladder, utrine tubes and collecting ducts of kidneys; protection, secretion and absorption |
| Pseudostratified Ciliated Columnar Epithelium | appears to be layered; located in nasal cavity, trachea, and bronchi; portions of male reproductive tract |
| Stratified Columnar Epithelia | relatively rare; has either two layers or multiple layers; located in small areas of pharnyx, epiglottis, anus, mammary glands, salivary gland ducts and uretha; protection |
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