UB BIO 200 - Study Guide Tissues (5 pages)

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Study Guide Tissues



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Study Guide Tissues

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Pages:
5
School:
University at Buffalo, The State University of New York
Course:
Bio 200 - Evolutionary Biology
Evolutionary Biology Documents

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Study Guide Tissues Chapter 1 A tissue is a group of cells having similar structure and function 2 There are 4 basic types of tissues Epithelial Connective Muscular and Nervous 3 Epithelial Tissues are surface forming tissues These can cover external or internal surfaces of body or organs These lie on a common basement membrane 4 2 basic types of epithelial tissues are Simple and Stratified 1 Structure 2 Function 3 Examples Simple Epithelium 1 layered Absorption or secretion Squamous Cuboidal Columnar Stratified Epithelium 2 many layered Protection against wear tear Epidermis Lining of bladder 5 Epithelia are classified on the basis of number of layers simple or stratified and the shape of cells Squamous Cuboidal and Columnar Fig 4 4 depicts kinds of simple epithelium Simple Epithelium Squamous Cuboidal Columnar Pseudostratified 1 Cell Shape Flat and scale like box like as tall as wide Tall and column shaped Varied height 2 or 3 levels 2 of layers 1 layered 1 layered 1 layered 1 layered Look like stratified 3 Example Lining of blood vessels lungs Kidney tubules gland ducts Inner lining of intestine Lining of trachea 6 Stratified Epithelium is 2 many layered Most common is Squamous Stratified Epithelium The basal layers are living and mostly columnar or Cuboidal But the outer layers are flat and scale like when living the epithelium is called Non keratinized like the lining of mouth cavity and when dead due to accumulation of protein keratin the epithelium is keratinized like the epidermis of skin Fig 4 5 7 Stratified Cuboidal epithelium lines the bigger ducts of Sweat and Salivary glands 8 Columnar Stratified Epithelium is rare in human body and only the top layer is columnar Like in the lining of pharynx 9 Transitional Epithelium is many layered like normal stratified but its cells can stretch When it is stretched the number of layers is less than when epithelium is tension free It lines the lining of ureters and bladder Glands 10 Unicellular glands formed only of



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