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19 Cards in this Set
- Front
- Back
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Types of Epithelia
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Simple Squamous, Stratified Squamous, Simple Cuboidal, Stratified Cuboidal, Simple Columnar, Stratified Columnar (not depicted), Pseudostratified Columnar (not depicted as ciliated here), Transitional Epithelia
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How many types of tissue are there in the body, and what are they?
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4 types: Epithelia, Connective, Muscle, Nerve
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What are the characteristics/functions of Epithelial tissue?
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Barrier, linings of organs, linings of internal cavities, made mainly of cells, avascular (without blood vessels in it), simple or stratified, form passages, attached side and free side, mitotic rate is high (therefore prone to cancer)
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What is the Basment Membrane?
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Between an epithelium and the underlying connective tissue, is a layer called the Basement Membrane. The connected side of epithelial cells touches the resinlike Basal Lamina, which is connected to the fiberglasslike Reticular Lamina. (boat metaphor)
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What is Polarity in terms of Epithelia?
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The organelles line up (the nuclei are lined up in "poles", the mitochondria are lined up in "poles", etc.)
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How many types and shapes of epithelia are there?
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2 types (simple and stratified), 3 shapes (squamous, cuboidal, columnar).
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How many "kinds" of epithelia are there?
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There are 8
1 - Simple Squamous (squished) 2 - Simple Cuboidal (squareish) 3 - Simple Columnar (rectangular-ish) 4 - Stratified Squamous 5 - Stratified Cuboidal 6 - Stratified Columnar 7 - Pseudostratified Columnar Ciliated 8 - Transitional Epithelia |
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What does "stratified" mean in the context of epithelia?
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It means layered.
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What does "simple" mean in the context of epithelia
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It means only one layer.
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What are simple squamous epithelial tissues particularly suited for?
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They are good for diffusion.
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What are stratified squamous epithelial tissues particularly good for?
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They are strong (think "plywood") and good for areas that need to stand up to a lot of stress (inside mouth, hands).
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If you have to "choose" how to decide what kind of tissue it is, how do you do it?
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Go with what's on the outermost top layer.
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What is pseudostratified columnar?
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If every cell is touching the basement membrane it's still simple though it looks stratified. Also, it's ciliated (i.e. lines respiratory system and creates "mucous escalator")
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What is transitional epithelia?
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If all the cells are touching the basement membrane but sometimes it looks taller and thinner (i.e, empty bladder) and sometimes it looks shorter and stretchier (i.e. full bladder). This kind of tissue can be found in the urinary bladder and the ureters.
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What's a gap junction?
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Join cells (i.e. in cardiac muscle cells) with junctions of proteins that contain pores for flowthrough of ions and solutes.
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What's a tight junction?
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A junction that completely encircles an epithelial cell near its apex and joins it tightly with neighboring cells (think plastic harness on soda cans or tack welding)
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What's an Intermediate Junction?
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Two cells are kind of "glued" together and supported by microfilaments made of actin.
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Desmosome
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A patch that holds cells together and enables a tissue to resist mechanical stress, but doesn't totally encircle a cell...kind of "wired" together with mesh of glycoprotein filaments. (Think "boat deck attached to hull with metal parts" or "snap on a pair of jeans")
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Hemidemosome
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Half-demosomes that anchor basal cells of epithelial tissue to the underlying basement membrane.
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