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muscle
Question | Answer |
---|---|
Excitability | capacity of skeletal muscle to respond to a stimulus |
Extensibility | ability to be stretched |
Elasticity | ability recoil to original shape after being stretched |
Epimysium | |
fascia | connective tissue located outside the epimysium |
contractability | ability of skeletal muscle to shorten with force |
fibers | fasciculi are composed of single muscle cells |
perimysium | loose connective tisse surrounding the facicle |
Endomysium | each fiber is surrounded by connective tissue sheath |
Myofibrils | a thread like structure the extends to each end of fiber |
actin Myofiliment | thin myofiliment |
Actin Myofiliment | resembles two mintue strands of pearls twisted together |
Myosin Myofiliments | thick myofiliments |
Myosin Myofiliment | resemble bundles of minute golf clubs |
Motor Neurons | nerve cells that carry action potentials to skeletal muscles |
Synapse | each axon branch that connects to muscle |
Motor Unit | a single motor neuron and all the skeletal muscle fiber it innervates |
Presynaptic Terminal | enlarged nerve terminal |
Synaptic Cleft | space between the presynaptic terminal and the muscle cell |
Postsynaptic terminal | the muscle fiber |
Sliding filament mechanism | Sliding of actin myofiliments past myosin myofiliments during contraction |
Muscle twitch | contraction of entire muscle |
threshold | a level of stimulusa muscle fiber must reach before it will respond |
all-or-none response | when it reaches threshold, contract maximumly |
25-Lag phase | time between application of a stimulus to a motor neuron |
contraction phase | the time of contration |
relaxation phase |