BIOL 2401 Practical 3 Vocabulary
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each of the black spaces below before clicking
on it to display the answer.
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| Muscle Fiber | A muscle cell.
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| Sarcolemma | Plasma membrane of a muscle fiber.
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| T Tubules | Extensions of sarcolemma that penetrate deep into the muscle fiber enable action potential to penetrate interior of muscle cell.
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| Nuclei | Many nuclei located below sarcolemma of one muscle cell.
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| Sarcoplasm | The cytoplasm of a muscle fiber.
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| Sarcoplasmic Reticulum | Endoplasmic reticulum of muscle; stores Calcium.
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| Terminal Cisternae | Enlarged end regions of sarcoplasmic reticulum.
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| Triad | One T tubule with terminal cisternae on each side.
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| Myofibrils | Bundles of myofilaments surrounded by T tubules and sarcoplasmic reticulum.
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| Myofilaments | Protein fibers involved in muscle contraction.
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| Actin | Thin filament in muscle contraction.
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| Tropomyosin | Covers actin binding sites so myosin heads cannot bind.
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| Troponin | Binds calcium during muscle contraction and pulls tropomyosin off acting filaments so myosin heads can bind to actin.
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| Myosin | Thick filament in muscle contractions.
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| Myosin Heads | Bind to actin.
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| Sarcomere | Contractile units of muscle.
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| Z Line | Anchors the acting filaments.
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| M Line | Anchors the myosin filaments.
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| A Band | Dark band where myosin filaments are located; in center of sarcomere.
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| I Band | Light band where only actin filaments are located; at the ends of sarcomere.
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| Neuromuscular Junction | Site where somatic motor neuron connects a skeletal muscle fiber, located only on skeletal muscle fibers.
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| Motor End Plate | Specific region where synaptic terminal of a motor neuron synapses with one muscle fiber.
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| Motor Unit | All the muscle fibers innervated by one motor neuron.
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| Epimysium | Surrounds entire muscle.
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| Perimysium | Surrounds Fascicles (bundles of muscle fibers)
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| Endomysium | Surrounds individual muscle fibers.
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