In smooth muscle cells,______________ functions in a manner analogous to troponin.
A)myoglobin
B)calmodulin
C)tropomyosin
D)titin

Question

Quizplus · Accepted Answer

Calmodulin is a protein that binds to calcium ions and plays a key role in the regulation of smooth muscle contraction. Its function is similar to troponin, which is a protein found in skeletal and cardiac muscle cells that also binds to calcium ions and regulates muscle contraction. Tropomyosin is also a protein involved in muscle contraction, but it acts by regulating the interaction between actin and myosin filaments in skeletal and cardiac muscle cells. Myoglobin is a protein that binds oxygen in muscle cells, and titin is a large, elastic protein that helps maintain the structure and elasticity of muscle cells. Neither of these proteins has a direct role in regulating smooth muscle contraction.

In Smooth Muscle Cells,______________ Functions in a Manner Analogous to Troponin