Lec06 - Group of similar cells common embryonic origin...

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Group of similar cells common embryonic origin common function Histology study of tissues Diane Olin, 2009
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200 Different cell types Four primary tissue classes epithelial tissue connective tissue muscular tissue nervous tissue Histology (microscopic anatomy) study of tissues organ formation Organ = structure with discrete boundaries composed of 2 or more tissue types Diane Olin, 2009
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Epithelial Tissue covers surfaces because cells are in contact lines hollow organs, cavities and ducts forms glands when cells sink under the surface Connective Tissue supports and binds structures together stores energy as fat provides immunity to disease Diane Olin, 2009
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Muscle Tissue cells shorten in length producing movement ( contracts) Nerve Tissue cells that conduct electrical signals detects changes inside and outside the body responds with nerve impulses Diane Olin, 2009
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Embryo begins as single cell divides into many cells and layers (strata) 3 Primary germ layers ectoderm (outer) forms epidermis and nervous system endoderm (inner) forms mucous membrane lining GI tract and respiratory system and digestive glands mesoderm (middle) becomes mesenchyme wispy collagen fibers and fibroblasts in gel matrix gives rise to muscle, bone, blood Diane Olin, 2009
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Diane Olin, 2009
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Diane Olin, 2009
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Removal of living tissue for microscopic examination Useful for diagnosis, especially cancer Tissue preserved, sectioned and stained before microscopic viewing Diane Olin, 2009
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Closely packed cells forming continuous sheets Cells sit on basement membrane Apical (upper) free surface Avascular---without blood vessels nutrients diffuse in from underlying connective tissue Good nerve supply Rapid cell division Diane Olin, 2009
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Basal lamina from epithelial cells collagen fibers Reticular lamina secreted by connective tissue cells reticular fibers holds cells to connective tissue guide for cell migration during development Diane Olin, 2009
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Notice how the mitochondria are concentrated at the basal portion of cell-probably to provide energy for cell’s transport processes. Cilia are at apical portion; sweeping action needed there. By polarity we mean there is an unequal distribution of the organelles or features in the cell. It is not symmetrical either. Diane Olin, 2009
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All cells with the exception of metatastic cancer cells and blood have these They keep cells anchored to each other and to the matrix so that there can be proper growth and cell division. They enable cells to resist stress and
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This note was uploaded on 12/08/2011 for the course AMY 2A taught by Professor Jamesivey during the Spring '06 term at Riverside Community College.

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Lec06 - Group of similar cells common embryonic origin...

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