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25 Cards in this Set
- Front
- Back
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Functions of muscle
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Movement
Posture Joint Stability Heat production |
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Muscle tissu exhibits
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Excitability
contractility extensibility elasticity |
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Types of muscle
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Skeletal
Cardiac Smooth |
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Skeletal muscle is _________________ , usually attached to bone
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voluntary striated muscle
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Skeletal muscle exhibits ___________
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striations
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During muscle contraction, the muscle generates ____________ , followed by ___________ that moves the load
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internal tension
external tension |
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The plasma membrane is the ___________
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sarcolemma
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It has transverse (T) __________
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tubules
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________________ are made of myosin, shaped somewhat like a golf club
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Thick myofilaments
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The _________________ are made up of fibrous actin with bead-like subunits of globular actin
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thin myofilaments
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Action potentials in the ___________ give rise to action potentials in the ____________
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nerve fiber
muscle fiber |
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Nerve cell releases ___ into the _____________
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Ach
synaptic cleft |
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Ach attaches (binds) to ___________ of the surface of the muscle cell
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Ach receptors
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Ach opens ____________ channels in the cell membrane (depolarization begins)
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K+ and Na+
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The action potential spreads down _____________ and into the interior of the muscle cell
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the T-tubules
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Depolarization along the T-tubules results in a release of Ca+ from the terminal cisternae. Ca+ diffuses into the ____________
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sarcoplasm
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Ca+ attaches to __________ on the thin filaments
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troponin
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Ca+ binding to troponin causes ___________ to move, revealing ____________ sites on each actin monomer
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tropomyosin
myosin binding |
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Prior to activation the myosin head must be activated by “burning” ________________________
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the ATP molecule attached to it
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Myosin then attaches to the _________________
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thin filament (actin)
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As soon as myosin attaches to ___________ it initiates a power stroke that pulls the thin filament along the thick filament
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actin
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To detach myosin, ___________ to the myosin head
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ATP must bind
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The myosin head can then either ________________ or ______________________
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reattach and pull again
enter relaxation |
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When the stimulus from the nerve stops ________________________________ and back into the sarcoplasmic reticulum
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Ca+ diffuses out of the sarcoplasm
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The removal of Ca+ causes __________________ to return to their original shape and position
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troponin and tropomyosin
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