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