Lecture 5 - Organization of the Human Body tissues organs...

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Click to edit Master subtitle style Organization of the Human Body tissues, organs & organ systems
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Organization of the Human Body Organizational hierarchy: Cells Tissues Organs Organ Systems
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Tissues Groups of similar cells that act in concert to perform a particular function Cells in the tissue are held together by cell junctions (connections) and other support structures Four major types of tissue: Epithelial tissue Connective tissue Muscle tissue Nervous tissue
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Epithelial Tissue Covers body surfaces Lines body cavities and organs Forms glands Functions: get from jeannie
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Epithelial Tissue Structure Composed of one or more layers of epithelial cells Simple epithelium: once cell layer thick Stratified epithelium: multiple cell layers thick Three cell shapes Squamous: flattened Cuboidal: cube-shaped Columnar: column-shaped
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Simple Squamous
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Glandular Epithelia Secrete Substances Glands: Clusters of cells that are specialized to secrete substances Form from in-folding of epithelial tissue Exocrine glands Endocrine glands
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Exocrine Glands Secrete substances into ducts (passageways) Sweat glands Salivary glands
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