Lec4 Chapter 4

Lec4 Chapter 4 - Chapter 4 Organization and Regulation of...

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Chapter 4 Organization and Regulation of Body Systems
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Readings Chapter 3
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What is a tissue? Tissue - a collection of cells of the same type that perform a common function and forms a discrete region of an organ Various tissues come together to form organs which are specialized for particular functions Organs work together in organ systems
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There are 4 major tissue types in the body: 1. Connective – binds and supports body parts 2. Muscular – moves the body and its parts 3. Nervous – receives stimuli and conducts nerve impulses 4. Epithelial – covers body surfaces and lines body cavities All tissues consist of : cells matrix - fibrous proteins and ground substance (extracellular fluid) Tissue types
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1. Connective tissue Functions of connective tissue: binds and supports parts of the body storage heat production Transport
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3 main types of connective tissue A. Fibrous B. Supportive C. Fluid
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1. Connective tissue All have specialized cells, ground substance and protein fibers(collagenous, elastic, reticular fibers ) Ground substance is noncellular and ranges from solid to fluid The ground substance and proteins fibers together make up the matrix of the tissue
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A. Fibrous connective tissue There are two types: dense or loose, but both contain fibroblast cells with a matrix of collagen and elastic fibers Fibrous connective tissue: 1) loose connective tissue - much of the space is ground substance. 2) dense connective tissue - the fibers take up more space than the cells and ground substance. C ontains many collagen fibers like tendons and ligaments
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Loose connective tissue fibroblasts (cellular) suspended in jelly like matrix composed of white collagen and yellow elastin Loose fibrous tissue is found supporting epithelium and many internal organs (binds organs together)
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Dense connective tissue Dense regular connective tissue Dense irregular connective tissue Collagen fibers in closely packed parallel bundles Few blood vessels High tensile strength Tendons, Ligaments -mainly straps of tightly packed collagen fibers Tendons ( muscle-bone) Ligaments (bone- bone) Collagen bundles arranged randomly Resists tearing in any directions Found in dermis of skin
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Adipose tissue is a special loose fibrous tissue where fat is stored
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B. Supportive connective tissue: Cartilage Cells are in chambers called lacunae Matrix is solid but flexible 3 types are distinguished by types of fibers 1. Hyaline cartilage – fine collagen fibers Location : Nose, ends of long bones and fetal skeleton Entire skeleton starts off as Hyaline cartilage, gradually ossifies to bone Elastic cartilage – more elastic fibers than cartilage fibers Location : Outer ear Fibrocartilage – strong collagen fibers Location : Disks between vertebrae
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Elastic cartilage Fibrocartilage
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B. Supportive connective tissue: Bone Cells are in chambers called lacunae Matrix is solid and rigid that is made of collagen and calcium salts
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This note was uploaded on 04/07/2009 for the course BIOL 115 taught by Professor Irving during the Spring '08 term at Illinois Tech.

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Lec4 Chapter 4 - Chapter 4 Organization and Regulation of...

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