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KIN 2500 - Tissues Answer Key test 1 - KIN 2500 Tissues...

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KIN 2500 – TissuesANSWER KEYSI: Matthew LandrySupplemental Instruction[email protected]Types of TissuesWhat is a tissue?A group of cells that usually have a commonorigin in an embryo and function together to carry out specificactivitiesBody tissues can be classified into four basic types of tissuesaccording to their structure and function. Describe theirfunctions:ooHistology is the study oftissuesCytology is the study ofcellsCell JunctionsCell junctions are contact points between the plasma membraneof tissue cells. There are four major types of junctions.Tight Junctions:consists of weblike stands of transmembraneproteins that fuse together the outer surfaces of two plasmamembranes (PMs); inhibit passage of substances between cells.oAn example of where you could find tight junctions wouldbein epithelial tissues that line the stomach, intestines,and urinary bladder.Adherens Junctions:contain plaque, a dense layer of proteins onthe inside of the plasma membrane (PM) that attaches both tomembrane proteins and to microfilaments of the cytoskeleton.oTransmembrane glycoproteins calledcadherinsjoin thecells.oThis type of junction helps epithelial surfaces resistseparation during various contractile activities. An exampleof this iswhen food moves through the intestines.Like adherens junctions,desmosomescontain plaque and havetransmembrane glycoproteins that extend into the intercellularspace between adjacent cells membranes and attach cells to oneanother.oHowever, unlike adherens junctions, this plaque of thisjunction, does not attach to microfilaments. It attaches toelements of the cytoskeleton known as intermediatefilaments, which consist of the protein keratin.1
KIN 2500 – TissuesANSWER KEYSI: Matthew LandrySupplemental Instruction[email protected]oThe purpose of desmosomes is toprevent epidermal cellsfrom separating under tension and cardiac muscle tissuefrom pulling apart during contraction.At gap junctions, membrane proteinsconnexinsform tiny fluid-filled tunnels called connexons that connect neighboring cells.oUnlike tight junctions, the plasma membranes areseparated by a narrow intracellular gap.This type of junction allows for the transportation ofions, impulses, and small molecules between cells.

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Term
Spring
Professor
Hargroder
Tags
cells, Epithelial tissue, Matthew Landry

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