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BIOL 2500 (21)
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Department
Biology
Course
BIOL 2500
Professor
Skibiel
Semester
Fall

Description
TISSUES • Tissues­ a group of cells similar in structure and serve a similar, specialized  function • 4 major categories: o epithelial­covering • covers body surfaces • lines body cavities and ducts • forms glands  characteristics: • cells closely packed with very little extracellular space • all have specialized cell to cell contact o tight junctions o desmosomes • polarity­ have top (apical surface) and bottom (basal  surface o epithelial tissue (ET) is always attached to  connective tissue (CT) via o basement membrane: point of attachment for ET  and CT, made up of    basal lamina ­ glycoproteins from ET  +collagen fibers   reticular lamin ­ glycoproteins from CT  +Collagen fibers • avascular­ no blood supply • high regeneration rate (like zombies) o mitosis to replace lost cells • specializations o cilia­ hairlike substances that serve to propel  ex; nasall cavity, trachea o microvilli­  ex: small intestines  arrangement and shape • arrangement o simple­ single layer of cells o stratified­ 2+ layers of cells o pseudostratified­ single layer of cells that looks  stratified o transitional­ many layer; cells can stretch or expand • shape o squamous­ scale­like o cuboidal­ cubes o columnar­ column Types Function Location 1) Simple Squamous Diffusion/Filtration Kidney glomeruli; air sacs of lungs; lining of heart,  blood vessels, and lymphatic vessels; lining of ventral 
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