Notes-Chapter 4-Histology-Fall 2014 - Updated July 2013...

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TISSUESPg 109-147Chapter 4Updated July 2013
Objectives1) Know the main tissue types and discuss their roles in the human body.2) Know the four types of tissue membranes and the characteristics of eachthat make them functional.3) Describe the general characteristics and functions of epithelial tissue –including types of glands and how they are classified4) Describe the general characteristics and functions of connective tissue5) Describe the characteristics & types of muscle tissue and their function6) Describe the general characteristics and functions of nervous tissue andhow their characteristics enables information processing7) Know the effects of aging on tissues8) Know the main types of tissue injury and about how tissues are repaired
TissuesCollections of specialized cellsand extracellular substancessurrounding them.There are 4 types of bodytissues based on structure ofcells, composition ofextracellular matrix, and cellfunction:1. Epithelial tissue2. Connective tissue3. Muscle tissue4. Nervous tissue
TissuesTissues are INTERDEPENDENTMuscle tissue cannot produce movementunless it receives oxygen carried byRBC’s (connective tissue)New bone tissue cannot form unlessepithelial tissue absorbs calcium andother nutrients from the digestive tractIf disease destroys the tissues of vitalorgans, all body tissues will eventuallydie
HistologyHistology – the microscopic study oftissuesBiopsy – process of removing tissuesamples for patients surgically or witha needle
Purpose:to cover and protect surfaces,both outside and inside the bodyRefers to ‘sheets of cells’ that cover exterior surfaces of thebody, lines internal cavities and passageways, and formscertain glands1. EPITHELIAL TISSUE(aka: epithelium)
Characteristics1. Mostly composed of cellsVery little extracellular matrix betweenthemEpithelial Tissue
Characteristics2. Covers body surfacesCovers ‘body surfaces’Exterior surfaceLining of digestive tractLining of respiratory tractHeartBlood vesselsLinings of many body cavitiesForms glands that are deriveddevelopmentally from body surfacesEpithelial Tissue
Characteristics3.Distinct Cell Surfacesmost have one free or apicalsurface not attached to other cellsLines the lumen of ducts, vessels and cavitiesA lateral surface attached to other epithelial cellsA basal surfaceAttached to the basement membrane (a specializedtype of extracellular material secreted by epithelial &connective tissue)Basement Membrane – helps attach theepithelial cells to the underlying tissueEpithelial Tissue
Characteristics4.Cell & Matrix Connectionsspecialized cell contacts bind adjacent epithelial cellstogether and to the extracellular matrix of the basementmembraneEpithelial Tissue
Characteristics5.

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Term
Spring
Professor
crane
Tags
Physiology, Anatomy, Membranes, Epithelial tissue

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