Choose all of the following that are consistent with the regulation of contracti

Question

Choose all of the following that are consistent with the regulation of contraction of striated muscle 1) Ca2+ bound troponin removes the block that keeps crossbridges from forming to go from rest to active contraction, a muscle fiber increases the intracellular Ca2+ 2) concentration 3) the stimulus for contraction inside the cell is acetylcholine (ACh) 4) at rest, tropomyosin blocks crossbridges during a contraction, tropomyosin moves away from the locations in which 3) crossbridges form interactions with the thin filament 6) phosphorylation of myosin regulates contraction

Explanation / Answer

1)Ca2+ bound troponin removes the block that keeps croosbridges from forming in the contraction of striated muscle, 2) to go from rest to avtive contraction, amuscle fiber increases the intracellular ca2+ concentration.    3)the stimulus for contraction inside the cell is acetylcholine, 4) at rest, tropomysin blocks crossbridges 5)during a contraction tropomyosin moves away from the location in which crossbridges form interations with the thin filament. these factors are consistent with the regulation of contraction of striated muscle. but phosphorylation of myosin regulates contraction is seen in the smooth muscles.

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