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Muscle System

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Functions of the muscle system

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Terms in this set (28)

Functions of the muscle system

motion, movement of substances, posture, heat production

muscle prefixes

myo, mys, sarco

Involuntary muscle found inside many internal organs of the body; not striated

Image: smooth muscle

Involuntary muscle tissue found only in the heart; striated; intercolated discs

Image: cardiac muscle

skeletal muscle

striated and voluntary

Image: skeletal muscle

Muscle Fascicle

bundle of muscle cells/fibers

Muscle Fiber/Cell

an elongated multinucleated cell with a striated appearance

rodlike contractile components that occupy most of the muscle cell volume, made up of myofilaments

the contractile unit of skeletal muscle composed of myofilaments which are made of contractile proteins, bordered by Z lines

Myofilament/filament

thick myosin filaments and thin actin filaments. Movements between these contractile proteins cause skeletal muscle contraction

light band-contains actin (thin filament)

dark band-contains myosin (thick filament) and actin

H zone of sarcomere

thick filaments only, between ends of actin, gets smaller during muscle contraction

the ends of the sarcomere, actin connects to the z-line

Sarcoplasmic Reticulum

endoplasmic reticulum in muscle fibers; "holey" sleeve positioned longitudinally to myofibrils