Chapter_4

Chapter_4 - 1/15/2010 Tissues What are tissues? Classified...

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1/15/2010 1 Chapter 4: Tissues What are tissues? Classified based on their structure & function : What are the 4 types of tissues found in the human body? and where do you find them? Epithelial Tissue (Epithelium) Protective covering for the body Avascular Regenerates easily Forms membranes, ducts, & the lining of body cavities Traps foreign particles via mucus-secreting (goblet ) cells and cilia what is the term for epithelium of internal body surfaces? Classification of Epithelial Tissue Simple Squamous Epithelium Thinnest tissue of the body Covers organs Lines blood vessels, lymph vessels, Forms membranes Allows transport across membranes Image Source: 2006 Pearson Education, Inc.; webanatomy.net/histology Simple Cuboidal • Common in • Forms walls of kidney tubules • Covers the ovaries Simple Columnar • Lines the digestive tract cells secrete digestive enzymes & absorb nutrients (have microvilli) often include goblet cells Image Source: 2006 Pearson Education, Inc.; webanatomy.net/histology
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1/15/2010 2 Pseudostratified Columnar Epithelium Major tissue in respiratory & reproductive tracts May be ciliated or non-ciliated Functions: Secretion & movement of mucus in the lungs Movement of ovum from ovaries uterus Image Source: 2006 Pearson Education, Inc.; webanatomy.net/histology Stratified Epithelium Stratified Squamous Epithelium : designed to protect the underlying layers, where friction is common; such as? Stratified Cuboidal Epithelium : lines the lumen of mammary glands, sweat & salivary glands, and the pancreas Stratified Columnar Epithelium : lines parts of the male Stratified Transitional Epithelium : wrinkled designed to allow for distensibility; where would you find it? Glandular Epithelium Exocrine vs. Endocrine glands? Examples of exocrine glands? Examples of endocrine glands? What substance do the endocrine glands secrete? Classification of Exocrine Glands By method of secretion Merocrine/ Eccrine Exocytosis – e.g. salivary & sudoriferous (sweat) glands Apocrine – lose portions of their cell membrane – e.g. mammary glands Holocrine – release entire cells; e.g. sebaceous (oil) glands Connective Tissue The Supporting fabric of all body parts Blood supply: from very well vascularized to avascular Has large amounts of extracellular matrix What is the extracellular matrix composed of? Connective Tissue
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Chapter_4 - 1/15/2010 Tissues What are tissues? Classified...

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