chapter 29 edited

Chapter 29 edited - Animal Tissues and Organ Systems Chapter 29 Working Together Cells tissues and organs interact smoothly when the bodys internal

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Animal Tissues and Organ Systems Chapter 29
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Working Together Cells , tissues , and organs interact smoothly when the body’s internal environment is maintained within a range that individual cells can tolerate ( homeostasis )
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Tissues Tissue Aggregation of cells and intercellular substances that perform one or more common tasks Four types of tissues Epithelial, connective, muscle and nervous
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29.1 Epithelial Tissues Cover the body surface and line internal cavities and tubes Microvilli increase surface area for absorption Epithelium has one free surface exposed to either a body fluid or the environment
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Epithelium
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Characteristics of Epithelium
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Epithelial Tissues: Glands Gland cells and glands are derived from epithelium Endocrine glands are ductless and secrete hormones Exocrine glands secrete other products (sweat, milk) through ducts to body surfaces
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Glandular Epithelium
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Cell Junctions in Animal Tissues Permit rapid transfer of ions and small molecules between cells Adhering junctions cement neighboring cells together Tight junctions prevent substances from leaking across a tissue Gap junctions are open channels that connect the cytoplasm of abutting cells
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Cell Junctions in Animal Tissues
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29.2 Connective Tissues Connect tissues to one another, functionally and structurally Different types bind, organize, support, strengthen, protect, and insulate other tissues All contain cells scattered within an extracellular matrix of their own secretions
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This note was uploaded on 03/10/2011 for the course BIOL 1409 taught by Professor Staff during the Spring '11 term at Dallas Colleges.

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Chapter 29 edited - Animal Tissues and Organ Systems Chapter 29 Working Together Cells tissues and organs interact smoothly when the bodys internal

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