Nbme 15

During an experiment of muscle contraction, intracellular Ca is decreased after a substance is administered to a muscle preparation obtained from experimental animal. which of the following best explains why contraction is inhibited in this case? A- Ach release increase B- Depolarization a long T-tubules is enhanced C- Myosin binding sites on actin remain covered with TROPONIN C !! D- Na influx is increased E- Tropomyosin is dettached from actin Answer keys say C which doesn't make sense... NBME 15
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