BIO 309D S08 Lec5 - Organization of the Human Body tissues,...

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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 Your body has over 200 different specialized type of cells
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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 Functions Covers body surfaces Lines body cavities and organs Forms glands Functions Protection (form barriers) Regulates movements of substances in/out (just like membranes) Secretes substances
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Epithelial Tissue Structure Composed of one or more layers of epithelial cells Simple epithelium : one cell layer thick Stratified epithelium : multiple cell layers thick Three cell shapes Squamous : flattened Cuboidal : cube-shaped Columnar : column-shaped End up with 6 different types of epithelial tissues
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Epithelial cells type 1 Really know structure and function for test 1
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Epithelial tissue cells type 2
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Epi tissue cells Type 3
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ETC Type 4
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ETC Type 5 Have villi and microvilli on top of them to increase surface area and aid in absorption
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Type 6 Don’t see these very often
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Glandular Epithelia Secrete substances Glands Cluster of cells that are specialized to secrete substances Form from infolding of epithelial tissue Exocrine glands - outside Endocrine glands - inside Mostly have cuboidal and columnal **question - glandular epithelia secretes substances. Which do you expect to see a lot of in these cells? A. Exocytosis B. Endocytosis - both. **question - GE secrets substances. Which do you expect to see a lot of in glandular cells that secrete lots of steroid hormones? Answer - smooth endoplasmic reticulum
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Exocrine Glands Secrete substances into ducts (passageways) Sweat glands Salivary glands Sebaceous glands (oil glands)
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Endocrine Glands Ductless Secrete substances (hormones) into body fluids Thyroid Pancreas pituitary
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BIO 309D S08 Lec5 - Organization of the Human Body tissues,...

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