Body Tissues
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| show | The study of tissues
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| show | A group of cells performing similar functions
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| show | A substance produced by the cells of a specific tissue and CAN contain protein fibers, salts, H2O and dissolved macromolecules
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| 4 Types of Tissue | show 🗑
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| Epithelial Tissue | show 🗑
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| Characteristics of Epithelial Tissue | show 🗑
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| show | All epithelial tissues lack blood vessels. The cells receive their nutrients by diffusion from underlying tissues.
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| show | Highly innervated to give info about the outside
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| show | Because apical surface is constantly exposed to the environment, epithelial cells are frequently damaged or die. They are replaced as quickly as they are lost
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| show | - Physical protection - Selective permeability – regulates the passage of certain molecules in or out of a certain region of the body- Secretion- Sensations
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| BASEMENT MEMBRANE | show 🗑
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| 2 LAYERS OF BASEMENT MEMBRANE | show 🗑
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| Epithelial cells are strongly bound by | show 🗑
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| TYPES OF INTERCELLULAR JUNCTIONS | show 🗑
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| TIGHT JUNCTIONS | show 🗑
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| ADHERING JUNCTIONS | show 🗑
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| show | -Dsn't encircle cell(like a button or snap between 2 adjacent cells)-Sites of mechicanical stress-Thickened protein plaque on ea of the apposed cell membranes w/ a network of proteins spanning intercellular space between plaques (cytoplasm side)
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| show | - Fluid-filled channels that directly connect the cytoplasms of apposed cells sharing these structures- These structures allow adjacent cells to communicate with each other by the flow of ions and other small molecular messengers
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| show | Classified according to two criteria:1. Number of layers of cells2. Shape of the cells
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| show | 1. Simple epithelium 2. Stratified epithelium3. Pseudostratified epithelium
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| SIMPLE EPITEHLIUM | show 🗑
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| show | two or more layers of cells. Not all cells have an apical surface nor do all cells attach to the basement membrane
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| PSEUDOSTRATIFIED EPITHELIUM | show 🗑
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| show | - Squamous – flattened and similar to the shape of a fried egg- Cuboidal – about the same size on all sides. The nucleus is usually centrally located- Columnar – taller than they are wide and nucleus is oval and located in the basal region of the cell
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| show | - Found lining the inside of the urinary bladder- Changes shape between squamous and cuboidal depending on whether bladder is full and its wall is stretched or empty and its wall is contracted
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| show | Most diverse, abundant, widely distributed and structurally varied of all 4 tissue typesFunction is to “connect” one structure to another structure; CT is the “glue” and “filler” of the body
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| Examples of CT | show 🗑
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Created by:
Tlmk
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