Animal Tissue Epithelial tissue Connective tissue Muscle tissue Nervous tissue.
Muscle tissue
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MUSCLE TISSUE
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MUSCLE TISSUE
// AGGREGATES OF SPECIALIZED ELONGATED CELLS, PRIMARY FUNCTION IS CONTRACTION
INTERACTION OF MYOFILAMENTS
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CLASSIFICATION
STRIATEDSKELETALVISCERAL STRIATEDCARDIAC
SMOOTH
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SKELETL MUSCLE
MUSCLE FIBERS/CELLS MESENCHYMAL, FUSION OF
MYOBLAST SIZE VARIABLE ENDOMYSIUM PERIMYSIUM, FASICLES EPIMYSIUM
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MUSCLE FIBER LONGITUDINAL MULTINUCLEATED CROSS STRIATIONS TRANS. SECTION
POLYGGNOL WITH FLAT NUCLEI
10—100 micrometer
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MUSCLE FIBER
SARCOLEMMA SARCOPLASM MYOFIBRILS MYOFILAMENTS SARCOPLASMIC REITCULUM
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MYOFIBRILS
LONGITUDINALLY ARRANGED SUBUNITS WITHIN A FIBER
COMPOSED OF BUNDLES OF MYOFILAMENTS
ACTUAL CONTRACTILE ELEMENTS ARRANGMENT CROSS STRIATIONS SARCOMERE
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CROSS STRIATIONS STAINED UNSTAINED
PREPARATIONS A BAND( DARK) I BAND
( LIGHT) A BAND MYOSIN
FILAMENT BIREFRINGENT
ANISOTROPICCENTER OF SARCOMERE
H ZONE & M LINE I BAND ACTIN FILAMENT
MONOREFRINGENT & ISOTROPICADJACENT SARCOMEREZ LINE
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THIN FILAMENT F ACTIN TROPOMYOSIN &
TROPONIN F ACTIN double stranded
polarized helix, polymers of G ACTIN
Anchored to Z line alpha actinin
I band, edges A band TROPOMYOSIN double helix,
grooves,mask binding sites TROPONIN 3 subunits TnC___Ca
TnT___troponin to tropomyosin TnI___actin
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Z LINE
ZIG ZAG FILAMENTOUS +Z MATRIX ANCHORS THIN FILAMENTS OF
ADJACENT SARCOMERE THRU ALPHA ACTININ
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THICK FILAMENTS MYOSIN II A BAND 2 HEAVY & 2PAIRS OF LIGHT CHAINS HEAVY MYOSIN rod like part with globular heads LIGHT CHAIN heads BINDING SITES ATP & ACTIN HEADS FORM CROSS BRIDGES b/w THICK &
THIN H ZONE NARROW CENTRAL REGION WITHOUT
HEADS ACESSORY PROTEINS
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SARCOPLASMIC RETICULUM
SER AI------AI BAND TERMINAL CISTERN Gated Ca
channel T TUBULES voltage sensor protein TRIAD MITOCHONDRIA & GLYCOGEN
GRANULES
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Muscle contraction
SARCOMERE SHORTENS > OVERLAP b/w THICK & THIN
FILAMENTS A BAND REMAINS SAME IBAND SHORTENS
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CONTRACTION
ATTACHMENT RELEASE BENDING FORCE GENERATION RE ATTACHMENT
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MUSCLE FIBERS
RED, WHITE & INTERMEDIATE MYOGLOBIN OXYGEN BINDING
PROTEIN MITOCHONDRIA CYTOCHROMES
ELECTRON TRANSPORT COMPLEXES
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RED WHITE SMALL SLOW TWITCH > MYOGLOBIN &
MITOCHONDRIA RESISTANT TO
FATIGUE SLOW CONTRACTION < NEUROMUSCULAR
JUNCTIIONS LONG MUSCLES OF
BACK
LARGE FAST TWITCH < MYOGLOBIN &
MITOCHONDRIA FATIGUE RAPIDLY RAPID CONTRACTION > NEUROMUSCULAR
JUNCTIIONS EXTRAOCULAR &
DIGITAL
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CARDIAC MUSCLE
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LIGHT MICROSCOPE BRANCHING SYNCITIUM 10—14 micrometer 100 micrometer long ENDOMYSIUM less well organized,
PERIMYSIUM SARCOLEMMA NUCLEUS single central SARCOPLASM perinuclear INTERCALATED DISC
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ELECTRON MICROSCOPE
MYOFIBRILS not well demarcated SARCOPLASM
Abundunt mitochondriaSarcoplasmic reticulumFat droplets GlycogenLipofuscin pigment granules
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SARCOPLASMIC RETICULUM
CISTERNS narrower with frequent anastomosis
T tubules are wider, external lamina
T tubules at the level of Z band No dilated terminal cistern DIAD
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INTERCALATED DISC L/M Cross bands
0.5—1 micrometer
Specialized areas of cell junction
Step wise Zonula adherens,
desmosomes, gap junction
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SMOOTH MUSCLE SPINDLE SHAPED CELLS, SMALLER // TO EACH OTHER (close packing & efficient
transfer of force) BASAL LAMINA, RETICULAR LAMINA DIAMETER LENGTH 20-500 micrmeter SINGLE CENTRAL NUCLEUS,(COCK SCREW) TRAN. Sect.
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ELCTRON MICRSCOPEBASAL LAMINA, RETICULAR LAMINA Complete covering( nexus)
PLASMA MEMBRANEalternnate areas of a) dense submembrane patches
b) uncoated regions
GAP JUNCTIONS BLOOD SUPPLY LESS EXTENSIVE
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SARCOPLASM
ORGANELLES at each end of nucleus
RUDIMENTRY S.E.R NO T TUBULES TWO CYTOPLASMIC DOMAINS CYTOSKELETON & CONTRACTILE
APPARATUS
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CYTOSKELETAL DOMAIN
LONGITUDINAL BUNDLES OF INTERMEDIATE & THIN FILAMENTS ASSOCIATED WITH DENSE BODIES
DENSE BODIES alpha actinin
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Contractile domain THIN & THICK FILAMENTS 1:15 THICK FILAMENTS ARE LABILE OBLIQUE TO CYTOSKELETON SUB MEMEBRANOUS DENSE BODIES TRANSMEMBRANE PROTEINS FBRONECTIN & LAMININ DISTRIBUTION & TRANSMISSION OF FORCE
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