MUSCLE PHYSIOLOGY TEST

MUSCLE PHYSIOLOGY TEST what is the muscle tissue behavior? Excitable, extensibility (stretches), elasticity, & contractility What are types of muscle tissue? skeletal for skeletal movement, cardiac for heart beat, smooth for internal organ movement. Who are the thin moving myofilaments? actin Who are the thick nonmobile myofilaments? myosin What is all the fibers with its motor neuron called? Motor unit What is the A band? actin and myosin What are the steps of sliding filament model? 1) Myosin heads ATTACHES to actin forming crossbridges 2) Myosin heads PIVOTS toward center of the sarcomere (power stroke) 3) As myosin heads bind ATP, the crossbridges DETACHES from actin 4)Myosin heads split ATP and become REORIENTED/RETURN TO NORM and energized Describe cardiac muscle Heart muscle it is striated and branched, involuntary, reacts quickly & uninucleated with intercalated discs Describe skeletal muscle Multinucleated, striated and voluntary Describe smooth muscle uninucleated, non-striated, involuntary lines hollow organs flat tendon aponeurosis What are the types of muscle attachments? Directly attached to bone, indirectly to a sheath-like tendon that attaches to bone, or aponeurosis a sheetlike, flat tendon(abdomen) In the sliding filament model, what is the function of calcium ions? To have tropomyosin to unblock the myosin binding sights. What is the action potential? a neural impulse; a brief electrical charge that travels down a motor neuron to stimulate a muscle What is the muscle layers outer to inner Endimysium bundles all fasicles-Permysium holds bundles of fibers-Endomysium cover sarcolemma Tetanus