3) MICROSCOPIC ANATOMY OF A SKELETAL MUSCLE FIBER

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11 Terms

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Sarcolemma

Plasma membrane of muscle

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Transverse tubules

Invaginations of sarcolemma

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Sarcoplasm

Cytoplasm of muscle fiber

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Myofibrils

Contractile organelles of skeletal muscle

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Sarcoplasmic reticulum

Fluid filled system of membranous sacs similar to smooth ER

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Terminal Cisterns

Dilated end sacs of sarcoplasmic reticulum

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Sarcomere

Basic functional unit of myofibril

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Filaments

Smaller protein structures within myofibrils

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  • Thick/myosin filaments

  • Thin/actin filaments

Two Types of Filaments

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Thick/myosin filaments

  • Composed of myosin

  • Has ATPase enzyme

  • Has heads 

  • Myosin and actin somewhat overlap

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Thin/actin filaments

  • Composed of actin

  • Anchored to z disc