Lab 3-1 copy.ppt - Human Anatomy Physiology Human A&P...

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Lab 3: Tissue Classification, Body Membranes and Skin Human Anatomy & Physiology Human A&P Laboratory Manual Volume 1: Second Custom Edition for APSU
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Lab 3 Activities 1. Learn the characteristics of the four main tissue  types including their developmental origins 2. Review histology slides illustrating the variations  of the four main tissue types 3. Review the major body membranes  4. Review histology slides illustrating the structure of  skin   5. Review skin model to reinforce understanding of  the structure of skin
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Embryonic Germ Layers and the Primary Tissue Types They Produce Fertilized egg (Cell division and differentiation)
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General Characteristics of Epithelial Tissues High Cellularity High Cellularity : densely packed into layer(s) with little extracellular matrix Polarity Polarity – two distinct sides apical surface facing a space (or potential space) basal surface supported by connective tissue Specialized Contacts – intercellular junctions attach cells together I nnervated nnervated but avascular avascular (no direct blood supply) Regeneration Regeneration – cells replaced at a high rate Derived from any of three embryonic germ layers
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Classification of Epithelial Tissues by the Shape of Cells
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Classification of Epithelial Tissues by the Number of Layers Simple epithelia simple squamous simple cuboidal simple columnar Stratified types named  according to cell shape  of the apical layer Stratified squamous
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Classification of Epithelial Tissues by the Number of Layers Note: some types do not  fit well into this scheme: Pseudostratified =  “falsely” stratified Transitional > changes  shape
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