Quizzes – Flashcards
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What is the correct order of skeletal muscle hierarchical organization, from largest structure to smallest structure?
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Entire muscle, muscle fasciculus, muscle fiber, myofibril
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The connective tissue sheath that surrounds an individual skeletal muscle fiber is called the ______?
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Endomysium
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The striated appearance of skeletal muscle fiber is mainly due to _______?
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The arrangement of the actin and myosin filaments
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The plasmalemma performs what functions?
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accommodating muscle fiber stretch
conducting action potentials
transporting nutrients into the muscle fiber
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What is the correct order of events in a contraction?
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T-Tubule action potential
Ca2+ released
cross-bridging
Ca2+ re-uptake
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The A-Band of a sarcomere contains ______?
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Actin and myosin filaments
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Satellite cells are responsible for ______?
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Growth and development
Injury repair
Adaptations to training
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ATP is required for?
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Both muscle contraction and muscle relaxation
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Which protein shields the myosin-binding site, preventing contraction from happening at rest?
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Tropomyosin
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The speed of muscle fiber contraction is determined primarily by?
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Speed of myosin ATPase
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Strength is most accurately a property of the?
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Motor system
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Rapid movement or ballistic-type training may be particularly effective in stimulating increases in motor unit
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Rate coding
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Resistance training can decrease inhibitory impulses to agonist muscles by reducing ?
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Autogenic inhibition
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Transient hypertrophy is primarily stimulated by
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Edema
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Which intracellular change likely contributes the most to increases in fiber size, cross-sectional area, and strength?
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More actin and myosin filaments
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Protein synthesis _____ during exercise and _______ after exercise.
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Decreases, increases
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Resistance training can lead to the conversion of _____ fibers into _____ fibers.
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Type IIx, Typer IIa
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Which sarcomere structure reveals the most information about the intensity of eccentric workouts
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Z-Disk
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____ is the term used to describe a muscle's "wasting away" after it is no longer used or challenged.
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Atrophy
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If recruitment is ______, meaning that motor units are recruited at the same time, more force will be produced and the rate of production will be increased
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Synchronous
