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10 Cards in this Set
- Front
- Back
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What is the first step of muscle contraction?
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Action potential depolarization opens presynaptic voltage gated Ca channels, inducing NT release
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What happens next?
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Postsynaptic ligand binding leads to mm cell depolarization in end motor plate
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What happens to the depolarization wave?
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Travels along mm cell and down to the T-tubule
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Which receptor is depolarized, causing which other receptor to release more calcium?
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Dihydropyridine receptor depolarizes, inducing conformational change of the Ryanodine receptor, causing release of calcium
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What does the released calcium bind to?
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Troponin C
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What happens to Myosin after Ca attaches to Troponin C?
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Myosin releases bound ADP and is displaced on actin filament causing the power stroke
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What kind of muscles are Type 1 muscles?
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Slow twitch, red fibers resulting from inc mitochondria and myoglobin concentration
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What kind of muscles are Type 2 muscles?
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Fast twitch, white fibers resulting from dec mitochondria and myoglobin concentration
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What kind of muscle is used for sustained contraction?
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Type 1
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What kind of muscle is used for weight training?
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Type 2
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