Chap3-2 - Tissues Groups of cells that are similar in...

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Unformatted text preview: Tissues Groups of cells that are similar in structure and function Have a common origin ABOUT TISSUES How do cells stay together? How do they communicate? ( allow chemical ions to tra vel to and fro) We call these JUNCTIONS ( Next) Membrane Junctions Gap Junctions- These spaces allow chemicals,ions to pass through thereby allowing cell to cell communication. CONNEXONS are the tubes which are seen between gap junctions. Desmosomes- Anchoring junctions; prevent cells from being pulled apart. Tight Junctions- Impermeable Junctions. While cells are bound together they are leakproof at these junctions. Plasma Membrane Specializations Membrane junctions Tight junctions Desmosomes Gap junctions Figure 3.3 Basement Membrane and Below Skin Tissue Types Epithelial Connective Muscle Nerve Epithelial tissue Covers surfaces Lines tubes and body cavities open to outside Epithelial tissue Covers surfaces Lines tubes and body cavities open to outside Functions protection absorption filtration excretion secretion sensory reception Characteristics Cells fit tightly together, bound by specialized junctions Have apical surfacefree edge Cells attached to or supported by basement membrane Avascular Regenerate if well nourished Classification Number of layers One--simple Two or more--stratified Shape of cell Irregular, flat--squamous Box-like--cuboidal Column-shaped--columnar Squamous Epithelium...
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Chap3-2 - Tissues Groups of cells that are similar in...

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