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