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Animal-Tissues.pdf - ANIMAL TISSUES Prepared by: LENOR M....

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ANIMAL TISSUESPrepared by:LENOR M. TUNACMAED-BIO
Objectives:List the types of animal tissuesDescribe the different types ofanimal tissuesGive and explain the function ofthe different animal tissues
Key TermsHistology:the study of tissues.Tissues:Simply groups of similar cells that worktogether performing the same taskGreatest form of teamwork in the body
Where are tissues found?With few exceptions, organs arecomposed of four basic tissuetypes:Epithelial TissueConnective TissueMuscular TissueNervous Tissue
Skin, the largest organ* made of all four tissue types
Why Study Histology?
Epithelial Tissue
Epithelial TissueMakes up 3% of your body weightThey don’t moveThey don’t send messagesTheir cells are all touching one anotherOf all tissues, they are the most widelyvaried in structure and function
Epithelial TissueForms the covering or lining of all freebodysurfacesbothexternalandinternal as in the skin and lining of theDTOne type of epithelium forms the outer layer ofthe skinAnother type of epithelium lines the air sacs ofthe lungsCells lie on the basement membraneandthecellsareheldtogetherbyintercellular cement.
Locations of Epithelial TissuesCovers the body (epidermis)Found on the inside of hollow organsand the outside ofallorgansFound above a connective tissue layer(epi = above)Lines the cavities, tubes, ducts, andblood vessels inside the body
Epithelial AnatomyApical surfaceupper surface that is free orexposed to the “exterior”Basal surfaceattached surface (below)Microvillismall fingerlike extensions thatincrease the surface area allowing for morework to be doneCilia-hair-like projections
Functions of Epithelial TissueProtects from physical & chemical injury andagainst microbial infectionprovide covering of the bodyContains nerve endings which respond tostimuliComprising the sensory organs of the bodyFilters, secretes & reabsorbs materialsProvide secretory portion in organs as well as inthe duct of these organsSecretes fluids to lubricate jointsLine the cavities of some internal organs asKIDNEY and DIGESTIVE TRACT
GENERAL CLASSIFICATION OFEPITHELIAL TISSUESAccording to the arrangement of cells,number of cell layersShape of cells1a. SIMPLE EPITHELIUM-epithelialcells are one layer thick2a. STRATIFIED EPITHELIUM-cells arearranged in two or more layer
Cell OrganizationSimplesingle layer of cells; typically foundwhere absorption and filtration occur or asingle layer of epithelial is neededsimple squamoussimple cuboidalsimple columnarStratifiedlayers of cells; common in areaswhere protection is needed like the skinstratified squamousstratified cuboidalstratified columnar

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