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Ch. 6 muscles
Question | Answer |
---|---|
muscle to shorten with force | contractility |
capacity of muscle to respond to a stimulus | excitability |
ability to be stretched | extensibility |
ability to recoil to original length after stretched | elasticity |
each muscle surrounded by connective tissue | epimysium |
surrounds and separates muscles | fascia |
surrounded by loose connective tissue | perimysium |
the fasciculi are composed of single muscle cells | fibers |
each fiber surrounded by a connective tissue sheath | endomysuim |
threadlike structure that extends from 1 end to other | myofibrils |
thin myofilaments | actin myofilaments |
thick myofilaments | myosin myofilaments |
actin and myosin myofilaments form highly ordered units | sarcomeres |
the charge difference across the membrane | resting membrane potential |
the brief reversal back of the charge | action potential |
nerve cells that carry action potentials to skeletal muscle fibers | motor neurons |
each branch that connects to the muscle forms a | neuromusclular junction |
a single motor neuron and skeletal muscle fibers innervates with | motor unit |