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10 cards from this deck
Muscles working in opposite directions; one contracts, other relaxes
Functional unit of muscle contraction between two Z-lines
Filaments slide past each other without shortening themselves
Remains constant (myosin filament length unchanged)
Blocks/unblocks actin binding sites; regulates contraction
Stores calcium ions; releases them to trigger contraction
Causes tropomyosin to shift, exposing actin binding sites
Formed when myosin heads attach to actin filaments
Active transport of calcium back into sarcoplasmic reticulum
About 10-15 seconds of maximum effort
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