Question

23. Which of the following events is involved in excitation-contraction coupling in skeletal muscle? A) Ca$^{2+}$-induced Ca$^{2+}$-released from the SR B) Binding of Ca$^{2+}$ to calmodulin C) Depolarization of the T-tubule membrane D) Phosphorylation of myosin by MLCK 24. Which of the following events is involved in cross-bridge cycling in smooth muscle? A) Activation of troponin by intracellular Ca$^{2+}$ B) Generation of action potentials within T-tubules C) Phosphorylation of myosin by myosin light-chain kinase D) Repositioning of tropomyosin after formation of the Ca$^{2+}$-calmodulin complex 25. A scientist is investigating the mechanism of a newly discovered blood-pressure lowering drug that reduces smooth muscle contractility. Which of the following is the most likely mechanism of action of this drug? A) It inhibits myosin light-chain phosphatases B) It is an antagonist of $\beta$-2 adrenergic receptors C) It inhibits the physical reposition of tropomyosin D) It activates the sarcolemmal Ca$^{2+}$ ATPase 7

          23.
Which of the following events is involved in excitation-contraction coupling in skeletal muscle?
A) Ca$^{2+}$-induced Ca$^{2+}$-released from the SR
B) Binding of Ca$^{2+}$ to calmodulin
C) Depolarization of the T-tubule membrane
D) Phosphorylation of myosin by MLCK
24.
Which of the following events is involved in cross-bridge cycling in smooth muscle?
A) Activation of troponin by intracellular Ca$^{2+}$
B) Generation of action potentials within T-tubules
C) Phosphorylation of myosin by myosin light-chain kinase
D) Repositioning of tropomyosin after formation of the Ca$^{2+}$-calmodulin complex
25.
A scientist is investigating the mechanism of a newly discovered blood-pressure lowering drug that
reduces smooth muscle contractility. Which of the following is the most likely mechanism of action of
this drug?
A) It inhibits myosin light-chain phosphatases
B) It is an antagonist of \(\beta\)-2 adrenergic receptors
C) It inhibits the physical reposition of tropomyosin
D) It activates the sarcolemmal Ca$^{2+}$ ATPase
7

23.
Which of the following events is involved in excitation-contraction coupling in skeletal muscle?
A) Ca^2+-induced Ca^2+-released from the SR
B) Binding of Ca^2+ to calmodulin
C) Depolarization of the T-tubule membrane
D) Phosphorylation of myosin by MLCK
24.
Which of the following events is involved in cross-bridge cycling in smooth muscle?
A) Activation of troponin by intracellular Ca^2+
B) Generation of action potentials within T-tubules
C) Phosphorylation of myosin by myosin light-chain kinase
D) Repositioning of tropomyosin after formation of the Ca^2+-calmodulin complex
25.
A scientist is investigating the mechanism of a newly discovered blood-pressure lowering drug that
reduces smooth muscle contractility. Which of the following is the most likely mechanism of action of
this drug?
A) It inhibits myosin light-chain phosphatases
B) It is an antagonist of β-2 adrenergic receptors
C) It inhibits the physical reposition of tropomyosin
D) It activates the sarcolemmal Ca^2+ ATPase
7

Added by Brittany C.

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