____ is not required for contraction of smooth muscle fibers.

Name: ____ is not required for contraction of smooth muscle fibers.
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Question

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Troponin is a protein found in skeletal and cardiac muscle fibers that plays a crucial role in regulating muscle contraction. However, smooth muscle fibers do not contain troponin, and thus it is not required for their contraction. Calcium and calmodulin are important in smooth muscle contraction, while ATP and phosphate provide the energy for muscle contraction.

____ Is Not Required for Contraction of Smooth Muscle Fibers