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In Tonic Smooth Muscle That Contracts Continuously for Long Periods

Question 65

Multiple Choice

In tonic smooth muscle that contracts continuously for long periods, the highly efficient "latch state" depends on


A) high myosin ATPase activity.
B) very slow turnover of ATP bound to myosin.
C) slow release of Ca2+ by troponin C.
D) high activity of myosin light-chain phosphatase.

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