Tissues Project No Sound
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Tissues Project No Sound






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    Tissues Project No Sound Tissues Project No Sound Presentation Transcript

    • Tissues
      • Group of cells similar in structure and function
      • 4 types:
      • - epithelial (covering)
      • -connective(support)
      • -muscle (movement)
      • -nerve (control)
      • Epithelia connective muscle nerve
    • Epithelia Tissue
      • Composed entirely of cells
      • Sheets of cells held together by tight junctions and desemomes
      • Form boundaries between environments
      • Regenerative-rapidly replace lost cells
      • Avascular but intervated-contains no blood vessels but supplied by nerve fibers
      • 6 functions:
      • - protection, absorption, filtration, excretion, secretion, sensory reception
      • classifications:
      • -#of layers-simple or squamos
      • -shape- squamos, cuboidal, columnar
      • Simple stratified tissues
      Like epithelia tissue, a brick wall forms a boundary between two different environments
    • Epithelia Simple
      • Main jobs:
      • -secretion, absorption, filtration
      • Single layer
      • Very thin=little protection
      • 3 types:
      • -simple squamos, simple cuboidal, simple columnar
      • Simple squamos simple cuboidal simple columnar epithelia tissues
    • Simple Squamos Epithelium
      • Single layer of flattened cells w/ discs shaped nuclei (resembles fried egg)
      • Functions:
      • -diffusion and filtration
      • Allows passage of material where protection not needed
      • Special types :
      • -Endothelium “inner covering”
      • *Provide slick, friction reducing lining in vessel and heart
      • -Mesothelium “middle covering”
      • *found in serous membranes of ventral body cavity
      • Simple cuboidal simple columnar epithelia simple epithelia tissue
    • Simple Cuboidal Epithelium
      • Single layer of cells tall as they are wide
      • Look like string of dark beads
      • Functions:
      • - secretion and absorption
      • Forms walls on small duct glands and kidney tubules
      • Simple squamos simple columnar epithelia simple epithelia tissues
    • Simple Coulumnar Epithelium
      • align like soldiers to form single layer of tall, closely packed cells
      • Lines digestive tract from stomach through rectum
      • Two main functions:
      • -absorption and secretion
      • Dual functions ideal for digestive tract
      • -dense microvilli on apical surface of absorptive cells and goblet cells which separate lubricating mucus
      • Cilia on free surface allow substance to move through passageways
      • Special type:
      • -pseudostratified columnar
      • * vary in height
      • * nuclei lie at different layers = false impression of several layers
      • *same functions as simple columnar and line respitory tract
      • Simple squamos simpe cuboidal epithelia simple epithelia tissues
      Simple columnar Psuedostratified epithelium
    • Stratified epithelia
      • Contains two or more layers
      • Regenerate from below:
      • -basal cells divide and push to replace
      • More durable than simple epithelia
      • Major role is protection
      • 4 types:
      • - stratified squamos
      • - stratified cuboidal
      • - stratified columnar
      • - transitional epithelium
      • Stratified cuboidal stratified columnar transitional stratified squamos epithelia tissue
    • Stratified Squamos Epithelium
      • Most wide spread of 4 types
      • Several thick layers=perfect for protection
      • Found areas subject to wear and tear
      • Depends on diffusion of nutrients
      • Forms external part of skin to every body opening connected to skin
      • Outer layer of skin keratinized
      • -tough protective protien
      • Stratified cuboidal stratified columnar transitional epithelia stratified epithelia tissue
    • Stratified Cuboidal Epithelium
      • Very rare
      • Found in large ducts
      • Usually has two layers
      • Stratified columnar stratified squamos transitional stratified epithelia epithelia tissues
    • Stratified columnar epithelium
      • Not common
      • Found in pharynx, male urethra, and glandular ducts
      • Only apical layer is columnar
      • Stratified cuboidal stratified squamos transitional stratified epithelia epithelia tissues
    • Transitional Epithelium
      • Forms lining in urinary organs
      • Basal layer cells:
      • - cuboidal or columnar
      • Apical layer cells:
      • - vary depending on degree of distention
      • Cells change shape to allow urine to be stored
      • Stratified squamos stratified cuboidal stratified columnar stratified epithelium epithelia tissues
    • Connective Tissue
      • Found everywhere in body
      • Most abundent and distributed of primary tissues
      • Functions:
      • - binding and support, protection, insulation, and transportation
      • Characteristics:
      • - common orgin, degrees of vascularity, extracellular matrix,
      • Main elements:
      • -ground substance
      • *fills space between cells
      • -fibers
      • *provide support
      • -cells
      • *fundamental in connective tissue
      • 4 types
      • - proper, cartilage, bone tissue, and blodd
      • proper catilage bone tissue blood tissues
      Like connective tissue, chain links are used to bind and support
    • Connective Tissue Proper
      • 2 subclasses
      • -loose connective tissue
      • -dense connective tissue
      • Except for bone, cartilage, and blood, all connective tissue belongs in this class
      • Loose tissue dense tissue connective tissues
    • Loose Connective Tissues
      • 3 types
      • - areolar
      • -adipose
      • -reticular
      • Areolar adipose reticular connective tissues
      open handcuffs are like loose connective tissue as the bind and hold
    • Areolar Connective Tissues
      • 4 functions:
      • - support/binds tissues
      • -holds body fluids
      • -defends against infection
      • -stores nutrients
      • Loose arrangment of fibers, thus the name areola , which means “small open space”
      • Soaks up excess fluid when body inflamed
      • Most widely distributed connective tissue
      • Binds body parts together
      • Present in all mucus membranes
      • Adipose reticular loose connective tissue
    • Adipose Connective Tissue
      • Similar to areolar tissue in structure and function
      • Nutrient storing capacity much greater
      • Also known as fat tissues because adipocytes(fat cells) take up 90% of tissue’s mass
      • Highly vascularized
      • High metabolic activity
      • Makes up 18% f human’s body weight
      • Functions:
      • - shock absorber, insulator, stores energy
      • Areolar reticular loose connective tissue