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Chap. 6 muscles

anatomy chapter 6

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