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24 Cards in this Set
- Front
- Back
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Name the 4 things that compose skeletal muscle |
Muscle Cells Connective Tissue Blood Nerve Tissue |
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Name the 3 layers of (connective) tissue that surrounds skeletal muscle |
Epimysium Perimysium Endomysium |
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Two types of proteins that Myofibrils contain |
Actin Myosin |
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Thin, twisted filaments |
Actin |
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Large filaments |
Myosin |
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Regulatory proteins in the control of a muscle contraction (2) |
Troponin, Tropomyosin |
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Most important mineral in creating a muscle contraction |
Calcium
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What is released at the neuromuscular junction that stimulates the release of Calcium and begins the muscle contraction? |
Acetylcholine |
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A motor neuron and all of the muscle cells that it innervates is called |
motor unit |
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shortening of myofibrils occurs due to myosin cross-bridges extending to actin and pulling the actin molecule over the myosin
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Sliding Filament Theory |
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What provides the energy needed for a muscular contraction? |
ATP |
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contain high numbers of mitochondria, low ATPase activity, and are highly fatigue resistant
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Type 1 muscle fibers (Slow twitch) |
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contain relatively few mitochondria, high ATPase activity, and fatigue rapidly
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Type 2 X Fibers (Fast twitch) |
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contain relatively high numbers of mitochondria, high ATPase activity, and are fatigue resistant
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Type 2 A Fibers (Intermediate) |
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Successfull sprinters would possess a lot of what type of msucle fibers? |
Type 2 A and X Fast twitch |
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Reduction in muscle size |
Atrophy |
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Initial period of atrophy is due to |
Reduced muscle protein synthesis |
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Subsequent period of atrophy after initial period is due to |
Increased muscle protein breakdown |
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Isometric action |
No joint movement |
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Isotonic action |
Joint movement |
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Ideal muscle length for maximal contractility |
80-120% |
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Peak force generated by a muscle is ____ as the speed of the movement increases |
Decreased |
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Greatest amount of movement is generated at ___ speeds |
Slow |
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Which type of muscle fiber creates more force? |
Type 2 |
