anatomy chapter 6
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| contractility | the ability of skeletal muscle to shorten with force
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| excitability | the capacity of skeletal muscle to respond to a stimlus
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| extensibility | the ability to be stretched
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| elasticity | ability to recoil to their original resting length after they have been stretched
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| muscles help to produce _ _ _ _ essential for maintenance of normal body temperature | heat
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| each skeletal muscle is surrounded by a connective tissue sheath called the | epimysium
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| _ _ _ _ _ is another connective tissue located outside the the epimysium. | Fascia
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| what surrounds and separates the muscles | fascia
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| a muscle is composed of numerous visible bundles called | muscle fasciculi (fascicle)
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| fascicle are surrounded by loose connective tissue called | perimysium
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| The fasciculi are composed of single muscles cells called | fibers
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| Each muscle fiber is a single cylindrical cell containing several | nuclei
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| each fiber is surrounded by a connective tissue sheath called the | endomysium
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| the cytoplasm of each fiber is filled with | myofibrils
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| thread-like structure that extends from one end of the fiber to the other | myofibrils
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| myofibrils contain 2 major kinds of protein fibers | actin and myosin
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| define actin | thin myofilaments
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| define myosin | thick myofilaments
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| actin and myosin myofilaments form highly ordered units called _______ which are joined end to end to form the myofibril | sarcomeres
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| basic structural and functional unity of the muscle | sarcomeres
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| the sliding actin myofilaments past myosin during contraction | sliding filament mechanism
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| nerve cells that carry action potentials to skeletal muscle fibers | motor neurons
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| a single motor neuron and all the skeletal muscle fibers it innervates | motor unit
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| the ____ extends the length of the myosin | A band
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| where the muscle remains contracted without relaxing | tetany
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