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Ch 15 Muscle Phys.

BIOL 2401 Practical 3 Vocabulary

QuestionAnswer
Muscle Fiber A muscle cell.
Sarcolemma Plasma membrane of a muscle fiber.
T Tubules Extensions of sarcolemma that penetrate deep into the muscle fiber enable action potential to penetrate interior of muscle cell.
Nuclei Many nuclei located below sarcolemma of one muscle cell.
Sarcoplasm The cytoplasm of a muscle fiber.
Sarcoplasmic Reticulum Endoplasmic reticulum of muscle; stores Calcium.
Terminal Cisternae Enlarged end regions of sarcoplasmic reticulum.
Triad One T tubule with terminal cisternae on each side.
Myofibrils Bundles of myofilaments surrounded by T tubules and sarcoplasmic reticulum.
Myofilaments Protein fibers involved in muscle contraction.
Actin Thin filament in muscle contraction.
Tropomyosin Covers actin binding sites so myosin heads cannot bind.
Troponin Binds calcium during muscle contraction and pulls tropomyosin off acting filaments so myosin heads can bind to actin.
Myosin Thick filament in muscle contractions.
Myosin Heads Bind to actin.
Sarcomere Contractile units of muscle.
Z Line Anchors the acting filaments.
M Line Anchors the myosin filaments.
A Band Dark band where myosin filaments are located; in center of sarcomere.
I Band Light band where only actin filaments are located; at the ends of sarcomere.
Neuromuscular Junction Site where somatic motor neuron connects a skeletal muscle fiber, located only on skeletal muscle fibers.
Motor End Plate Specific region where synaptic terminal of a motor neuron synapses with one muscle fiber.
Motor Unit All the muscle fibers innervated by one motor neuron.
Epimysium Surrounds entire muscle.
Perimysium Surrounds Fascicles (bundles of muscle fibers)
Endomysium Surrounds individual muscle fibers.
Created by: Paiger89
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