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25 Cards in this Set
- Front
- Back
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An individual muscle cell
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muscle fiber
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The plasma membrane that encloses a muscle fiber
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Plasmalemma
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Cytoplasm of a muscle fiber
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Sarcoplasm
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The basic functional unit of a myofibril
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Sarcomere
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Motor Unit
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single a-motor neuron and all the muscle fibers it innervates
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Smallest functional unit of a muscle
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Myofibrils
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A sarcomere is composed of what two (2) filaments
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Thick and Thin filaments, which are responsible for muscle contraction
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The primary protein of the thick filament
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Myosin
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Myosin is composed of
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Two (2) protein strands each folded in to a globular head at one end
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Thin filament is attached to.....& composed of
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Z-disk......actin, tropomyosin, and troponin
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The role of ______ is to position the myosin filaments to maintain equal spacing between the actin filaments
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Titin
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Often referred to as an "anchor protein"
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Nebulin
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Provides a framework that helps stabilize the position of actin.
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Nebulin
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This muscle fiber tends to be larger and generates more force, cause they have more fibers per motor unit than others
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Type II
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The genes we inherit from our parents determine which ______ _______ _____ our muscle fibers
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a-motor neurons innervate
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Most skeletal muscles contain both
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type I & type II fibers
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The ATPase activities act slower in this muscle fiber
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Type I
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Has a highly developed Sarcoplasmic Reticulum (SR)
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Type II
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Delivers calcium into the muscle sell
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Sarcoplasmic Reticulum(SR)
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These fibers have higher aerobic endurance and well suited to low-intensity activities
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Type I
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When an a-motor neuron carries an action potential to its muscle fibers, all the muscles fibers fire in that motor unit
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All-or-none response
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Speed of a contraction affects
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Amount of force produced
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When is maximal for achieved in a concentric contraction
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closer to zero velocity(static) more force generated
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A muscles optimal length is when
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amount if energy stored and the number of linked actin-myosin cross-bridges are maximized.
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Force production is increased
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-through the recruitment of more motor units
-increase in the frequency of stimulation of the motor units |
