MUSCLE_TISSUE_CHAPTER_NINE.ppt - KANDEH 1 Table 9.3 TYPES OF MUSCLE TISSUES SKELETAL CARDIAC SMOOTH 1 1 1 2 3 4 5 6 ATTACHED TO BONES VOLUNTARY STRIATED

MUSCLE_TISSUE_CHAPTER_NINE.ppt - KANDEH 1 Table 9.3 TYPES...

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KANDEH 1
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Table 9.3
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TYPES OF MUSCLE TISSUES SKELETAL 1. ATTACHED TO BONES 2. VOLUNTARY 3. STRIATED 4. UNBRANCHED (CIGAR-SHAPED) FIBERS 5. MULTIPLE PERIPHERALLY LOCATED NUCLEI 6. NO INTERCALATED DISC CARDIAC 1. ATTACHED TO HEART 2. INVOLUNTARY 3. STRIATED 4. BRANCHED FIBERS 5. SINGLE CENTRALLY LOCATED NUCLEUS 6. HAS INTERCALATED DISC SMOOTH 1. WALLS OF HOLLOW ORGANS, BLD. VESSELS, IRIS, SKIN 2. INVOLUNTARY 3. NON-STRIATED 4. SPINDLE-SHAPED 5. 1 CENTRALLY LOCATED NUCLEUS 6. NO INTERCALATED DISC
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KANDEH 4 FUNCTIONS OF MUSCLE TISSUE 1. MOTION: - LIKE WALKING, RUNNING, GRASPING, NODDING 2. STABILIZING BODY POSITION:- (POSTURE) STANDING, SITTING & KEEPING HEAD UPRIGHT 3. REGULATING ORGAN VOLUME:- (URINE IN BLADDER) 4. MOVING SUBSTANCES THROUGH THE BODY:- ( PERISTALSIS) 5. HEAT PRODUCTION:- ( THERMOGENESIS): 85% OF ALL BODY HEAT IS GENERATED BY MUSCULAR CONTRACTION
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KANDEH 5 CHARACTERISTICS OF MUSCLE TISSUE a. Contractility Ability of a muscle to shorten & thicken thus generating force b. Excitability or irritability Capacity of muscle to respond to a stimulus c. Extensibility Muscle can be stretched to its normal resting length and beyond to a limited degree [ ABILITY TO STRETCH] d. Elasticity Ability of muscle to recoil to original resting length after stretched
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KANDEH 6 EPIMYSIUM -- ENCIRLES ENTIRE MUSCLE (DENSE IRREG.C.T.) PERIMYSIUM --(DENSE IRREG. C.T.) SURROUNDS10-100 FIBERS (CELLS) AND SEPARATES THEM INTO BUNDLES CALLED FASICLES ENDOMYSIUM --AREOLAR C.T. SURROUNDING EACH MUSCLE FIBER. THREE LAYERS EXTEND FROM DEEP FASCIA
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Table 9.1
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Figure 9.1 Bone Perimysium Endomysium (between individual muscle fibers) Muscle fiber Fascicle (wrapped by perimysium) Epimysium Tendon Epimysium Muscle fiber in middle of a fascicle Blood vessel Perimysium Endomysium Fascicle (a) (b)
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Figure 9.2c, d I band I band A band Sarcomere H zone Thin (actin) filament Thick (myosin) filament Z disc Z disc M line (c) Small part of one myofibril enlarged to show the myofilaments responsible for the banding pattern. Each sarcomere extends from one Z disc to the next. Z disc Z disc M line Sarcomere Thin (actin) filament Thick (myosin) filament Elastic (titin) filaments (d) Enlargement of one sarcomere (sectioned lengthwise). Notice the myosin heads on the thick filaments.
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KANDEH 10 SKELETAL MUSCLE HISTOLOGY Sarcolemma : -cell membrane t-tubules : -indentations of membrane filled with extracellular fluid Sarcoplasm: - cytoplasm of muscle cell Myoglobin: -red, oxygen binding protein
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KANDEH 11 Myofibrils -contractile elements within sarcoplasm of muscle fibers. Myofilaments -thick, thin, & elastic proteins within myofibril. Sarcoplasmic reticulum - modified e.r.: stores and releases calcium ions. Terminal cisterns -dilated ends of s.r. Triad -two terminal cisterns with a t-tubule between them.
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Figure 9.5 Myofibril Myofibrils Triad: Tubules of the SR Sarcolemma Sarcolemma Mitochondria I band I band A band H zone Z disc Z disc Part of a skeletal muscle fiber (cell) T tubule Terminal cisternae of the SR (2) M line
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KANDEH 13 FILAMENTS THICK FILAMENTS- MYOSIN(16Nm) THIN FILAMENTS - ACTINS (8Nm) ELASTIC FILAMENT - TITIN/CONNECTIN (<1Nm) THEY OVERLAP IN A SPECIFIC PATTERN PRODUCING ZONES AND BANDS YOU SEE HERE.
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