Chapter 5 Part 2

Chapter 5 Part 2 - How are epithelial tissues classified...

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How are epithelial tissues classified and held together? 9/26 1) What is a tissue? 2) What is the embryonic pattern of development that creates different tissues? 3) How do we “view” the things we see with a microscope? 4) How are epithelial cells classified? 5) What are the four types of single cell-layer epithelial tissues? 6) What are the four types of layered epithelial tissues?
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How do we classify/describe the different cell types that make up tissues, organs, organ systems and the body? “Tissue”: a set of cells with similar appearance and function together in an organ. How do we consider tissues? 1) Embryonic Origin : what cells were the embryonic precursors? 2) Shape/Appearance: are cells round, flat or cube etc? 3) Things leaving cells : Secretion vs. Excretion: S: material has physiological function E: waste removal from cell/body 4) Activity: Do cells use contraction, exocytosis, endocytosis or phagocytosis? 5) Matrix: What extracellular material is observed around the cells? Collagen, Elastin, Cartillage, Interstitial Fluids These factors let us classify the “tissue type”! Tissues classification lets us understand the cause/effects of diseases.
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How does the angle of observation affect what we observe? Two dimensional interpretation of three dimensional objects can be very difficult. Terms used to describe orientation of tissue section: Longitudinal View vs. Cross Sectional View Oblique View: Mix of the two for cells/tissue Histological fixing and sectioning of tissue Object on Slide Histological Staining of tissue “Colors” on Slide Sometimes fixation removes a part of the original tissue and what is “seen” on the slide is the remnant of where the cell
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This note was uploaded on 04/17/2008 for the course BIOL 211 taught by Professor Wilson during the Fall '07 term at Winona.

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Chapter 5 Part 2 - How are epithelial tissues classified...

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