Muscle Tissue Characteristics of Muscle

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Presentation transcript:

Muscle Tissue Characteristics of Muscle Responsiveness: to produce chemical signals coordinated with electrical charges Conductivity: to pass stimulus beyond local area to excite contraction Contractility: to shorten when stimulated Extensibility: to stretch between contractions Elasticity: to return to original shape

Skeletal Muscle Skeletal muscle: voluntary striated muscle attached to one or more bones Striations: caused by overlapping of contractile proteins

Myofilaments Myofilament: long protein cords, fills muscle cell A myofibril is a bundle of 3 myofilaments Myofilaments: Thick filaments: made of myosin, looks like a golf club Thin Filaments: are composed of two strands of proteins, F actin and G actin where G actin contains active sites where the head of myosin can bind Elastic filaments: made of titin, flanks the thin filament and anchors it to the Z disk

Striations A band (dArk band): consists of thick filaments that lay side by side I band (L(I)ght band): consists of thin and elastic filaments between thick filaments H band: a section of the A band that is not covered with thin and elastic filaments Z disk: a dense protein that anchors thin and elastic filaments, central to contraction of muscle

Striations Sarcomere: the functional contractile unit located between the Z disks

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