Which ONE of the following is NOT a feature of smooth muscle contraction? (Lecture: smooth muscle, Chapter: excitation-contraction coupling)

Question

Which  ONE  of the following is  NOT  a feature of smooth muscle contraction? (Lecture: smooth muscle, Chapter: excitation-contraction coupling)

Answer

Smooth muscle myosin is inactivated when myosin-light-chain phosphatase
removes the phosphate residue attached by myosin-light-chain kinase

Answer

Intracellular calcium binds to calmodulin (CaM) and the Ca-CaM complex activates a kinase.

Answer

An increase in cytosolic calcium induces calmodulin binding to myosin-light chain kinase.

Answer

The regulation of the actin-myosin interaction occurs by calcium binding to troponin.

Answer

Phosphorylation of the myosin light chain converts the myosin into its active form which can then bind to F-actin.

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