Muscles
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| SKELETON MUSCLE CYTOLOGY | 1.SARCOLEMMA (CELL MEMBRANE), SARCOPLASMA (CYTOPLASM), MULTINUCLEATED
2. MITOCHONDRIA
3. TRANSVERSE TUBULES
4. SARCOPLASMIC RETICULUM
5. MYOFIBRILS
6. MYOFILAMENTS
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| SKELETAL MUSCLE CELLS | SARCOLEMMA (CELL MEMBRANE)
SARCOPLASMA (CYTOPLASM)
MULTINUCLEATE MUSCLE
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| MITOCHONDRIA | RAPID ATP PRODUCTION, PROVIDES ENERY FOR MUSCLE CONTRACTION
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| MYOGLUBIN IN MITOCHONDRIA | HOLDS OXYGEN AT MUSCLE UNTIL NEEDED FOR ATP PRODUCTION
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| TRANSVERSE TUBULES | CELL MEMBRANE EXTENDS TO INTERIOR
OPENS TO OUTSIDE
INTERIOR OF TRANSVERSE TUBULES EQUIVALENT TO EXTERNAL ENVIRONMENT
CONDUCT IMPULSES FROM SARCOLEMMA TO INTERIOR
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| SARCOPLASMIC RETICULUM | STORES CALCIUM, REQUIRED FOR MUSCLE CONTRACTION
TRERMINAL CISTERNAE - PAIRS OF SR TUBULES ON EITHER SIDE OF T TUBULES, FORMS TRIADS
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| TERMINAL CISTERNA | PAIR OF SR TUBULES ON EITHER SIDE OF T TUBULES
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| MYOFIBRILS | BUNDLE OF THIN AND THICK MYOFILABMENTS
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| MYOFILAMENTS | THIN (ACTIN PROTIEN, SMALL DIAMETER), THICK (MYOSIN PROTEIN, LARGE DIAMETER)
ARRANGED IN GROUPS CALLED SARCOMERES
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| SARCOMERES | ARE SMALLEST CONTRACTIN UNIT
SPACE BETWEEN 2 SUCCESIVE Z LINES
THIN MYOFILAMENTS EXTEND PAST THICK WITHIN SARCOMERES
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| Z LINE | ANCHOR THIN MYOFILAMENTS, EXTEND IN OPPOSITE DIRECTIONS
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| A BAND | THIN, THICK MYOFILAMENTS OVERLAP, FORM STIATIONS
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| I BAND | THIN MYOFILAMENTS ONLY, INCLUDES Z LINE
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| H ZONE | SPACE BETWEEN THIN MYOFILAMENTS
THICK MYOFILAMENTS ONLY
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| M LINE | PROTIENS SECURED THICK MYOFILAMENT IN CENTER OF SARCOMERE
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| TITIN | EXTENDS FROM Z LINE THROUGH THICK MYOFILAMENTS TO M LINE
HOLD THICK MYOFILAMENTS IN PLACE
CONTRIBUTE TO MUSCLE CELL ELASTICITY - RETURN TO RESTING LENGTH
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