zoo_notes_4 - Zoo Exam 4 Notes 4/16/08 - Tissues &...

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Zoo Exam 4 Notes 4/16/08 -  Tissues & Homeostasis 260 cells subtypes in our body perform a specific function Epithelial Tissue (covering) Connective Tissue (support) Muscle Tissue (movement) Nervous Tissue (controls)  Epithelial Tissue Features: o that does this!!) o Covers things (like skin) o Covers or lines surfaces or forms glands (lines digestive  track and blood vessels) o Protection, secretion, absorption, filtration  Characteristics o Cellular (composed of just cells)  o tightly packed (to form a barrier)  o Avascular (lacks blood vessels)*** o Rests atop basement membrane o Polar (free surface = apical surface; attached  surface = basal surface) o Regenerates rapidly (ex: skin cells) Classifications  o By cell shape Squamous – squished  Cuboidal – cube Columnar – rectangular  o By cellular arrangement  Simple – one layer Stratified – more than one layer (name it by its  apical [free] surface) Specific types of Epithelia o Simple squamous QuickTime and a TIFF (LZW) decompressor are needed to see this picture. QuickTimeu and a TIFF (LZW) decompressor are needed to see this picture. QuickTimeu and a TIFF (LZW) decompressor are needed to see this picture. QuickTimeu and a TIFF (LZW) decompressor are needed to see this picture. QuickTimeu and a TIFF (LZW) decompressor are needed to see this picture.
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Filtration (kidney), diffusion (lunges) Ex: endothelium: lines blood vessels Alveoli of  Lung Bowman’s Capsule (in Kidney) o Simple cuboidal  Functions: absorption, secretions
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zoo_notes_4 - Zoo Exam 4 Notes 4/16/08 - Tissues &...

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