HUBS1403 Chapter Notes - Chapter 4: Tight Junction, Basal Lamina, Synovial Joint
24 Jun 2018
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TISSUES
Cell Junctions
•tight junctions -interlocking membrane proteins that prevent passage of water and solutes
•adhere ns junctions -resist separation during contractile activities
.desmosomes -link opposing membranes and resist mechanical forces
•hemidesmosomes -anchor epithelial cells To basement membrane
•
gap junctions -Cells held together by connexions
Epithelial Tissue
•factors that maintain integrity
°intercellular connections
°attachment To the basal lamina
.
°epithelial maintenance and repair
layers :simple ,pseudo stratified ,stratified
.shapes :squamous ,cuboidal ,columnar
.endocrine glands :release secretions →IF → bloodstream →regulation
.exocrine glands :release secretions onto epithelial surface ,mostly viaducts
.goblet cells :single secretory cells scattered through epithelia ,secrete mucins
Connective Tissue
.never exposed to outside environment
.composed of extracellular Matrix (protein fibres and ground substance )and cells
•composed of fibroblasts ,adipocytes ,immune cells
.tissue fibres composed of collagen ,reticular fibres ,elastic fibres
•loose connective tissue (areolar ,adipose ,reticular )
.dense connective tissue (regular ,irregular ,elastic )
.cartilage (hyaline ,fibro cartilage ,elastic )
.bone
•liquid (blood ,lymph )
Muscle Tissue
.muscles cells (myocytes)
.individual cells separated by endomysium
.skeletal muscle Tissue :long cells called fibres ;striated ,voluntary Muscle
.Cardiac muscle :branched fibres ;striated ,involuntary muscle
.smooth muscle :gap junctions allow contractions ;non -striated ,involuntary
Nervous Tissue Membranes
•specialised for the conduction .line or cover body surfaces
of electrical impulses .Consist of epithelium supported by
•two types of cells connective tissue
°neurons .mucous -secretes mucus ,lines cavities
°glial cells •Serous -minimises friction
.synovial -lines joints
.cutaneous -skin
Document Summary
Junctions tight junctions interlocking membrane proteins that prevent passage of water and solutes adhere ns junctions - resist separation during contractile activities desmosomes hemidesmosomes link opposing membranes epithelial anchor and resist mechanical forces cells. Tissue factors that maintain integrity intercellular connections attachment. To the basal lamina epithelial maintenance and repair layers : simple , pseudo stratified stratified shapes : endocrine squamous , glands : cuboidal columnar release secretions. If bloodstream release secretions onto epithelial surface. : single secretory cells scattered through epithelia , secrete mucins exocrine glands : cells. Tissue composed of composed of tissue loose dense cartilage ( hyaline , bone liquid ( blood lymph ) never exposed to outside environment extracellular. Matrix (protein fibres and ground substance ) and cells fibroblasts. , adipocytes , immune cells fibres composed of collagen , connective tissue ( areolar reticular fibres elastic fibres. , adipose , reticular connective tissue ( regular , fibro cartilage , irregular , elastic elastic )
