Structual organization of Skeletal Muscle
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each of the black spaces below before clicking
on it to display the answer.
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| What is the term for a single muscle cell? | Muscle fiber
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| The membrane surrounding the muscle fiber is...? | The sarcolemma
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| Specialized cytoplasm in the muscle is ...? | sarcoplasm
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| What are the threadlike units called made of actin and myosin? | Myofibrils
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| The functional unit of muscular contraction is the _____________? | sarcomere
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| These discs border the sarcomere on each end. | Z lines
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| These are projections on the myosin that physically link with the actin. | cross-bridges
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| What network of channels contains Ca++ to help activate muscle contraction? | sarcoplasmic reticulum
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| These channels run perpendicular to the sarcomeres and carry the Ca++ that are released by the SR | transverse tubules
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| What thin connective membrane surrounds the sarcolemma? | endomysium
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| This connective tissue surrounds the whole muscle and is continuous with the tendon. | epimysium
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| This connective tissue bundles muscle fibers into fascicles. | perimysium
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| This zone disappears when actin is moved towards the center of the sarcomere during a contraction. | H zone
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| This area of the sarcomere contains thick, rough myosin filaments, overlapped by thin, smooth actin filaments. | A band/Anisotropic band
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| This area of the sarcomere contains contains only thin actin filaments | I band/Isotropic band
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| This bisects the sarcomere into two equal portions | M line
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Created by:
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