Question | Answer |
skeletal muscle tissue | striated, voluntary (ex. found in biceps) |
cardiac muscle tissue | striated, involuntary , only found in heart |
smooth muscle tissue | nonstriated (smooth) involuntary (ex. found in digestive system, arteries, intestine) |
functions of skeletal muscle | produce body movement, stabilize body position, storing and moving substances within the body (ATP), generating heat (thermogenesis=shiverring) |
properties of muscle tissue | electrical excitability, contractilily, extensibility, elasticity |
superficial fascia | aka subcutaneous layer, separates muscle from skin |
deep fascia | holds muscles with similar functions together |
3 layers of connective tissue | epimysium, perimysium, endomysium |
epimysium | surrounds whole muscle |
perimysium | surrounds muscle bundles |
endomysium | surrounds individual muscle fibers |
tendon | all 3 layers of connective tissue connect at each end of a muscle and form this |
NMJ | neuromuscular junction; where muscle fiber and nerve (neuron) connect and communicate |
sarcolema | plasma (cell) membrane of muscle fiber |
Transverse tubules (T tubules) | extend from sarcolemma into sarcoplasm |
sarcoplasm | the cytoplasm of skeletal muscle fiber |
myofibrils | cylindrical structures within each muscle fiber, contains bundles of thick and thin myofilaments |
sarcoplasmic reticulum | "sleeve covering myofibril"; network of membranous channels surrounding each myofibril |
terminal cisternae | surrounds T tubule- expanded ends of SR on either side of T tubule; 2 to a tubule |
filaments | short protein structures arranged into sarcomeres consisting of thin actin and thick myosin filaments |