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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