The mechanism of contraction in smooth muscle is different from skeletal muscle in that ________.
A) ATP energizes the sliding process
B) the site of calcium regulation differs
C) the trigger for contraction is a rise in intracellular calcium
D) actin and myosin interact by the sliding filament mechanism

Question

Quizplus · Accepted Answer

The key difference in the mechanism of contraction between smooth and skeletal muscle lies in the site of calcium regulation. In skeletal muscle, calcium binds to troponin to initiate contraction, whereas in smooth muscle, calcium interacts with calmodulin.

The Mechanism of Contraction in Smooth Muscle Is Different from Skeletal