Question

the mechanism of contraction in smooth muscle is different from skeletal muscle in that

the site of calcium binding site differs

actin and myosin interact by the sliding filament mechanism

atp energizes the sliding process

the trigger for contraction is a rise in intracellular calcium

Explanation:

In skeletal muscle, calcium binds to troponin. In smooth muscle, calcium binds to calmodulin. Both use the sliding - filament mechanism (so option B is wrong). ATP is used for the sliding process in both (so option C is wrong). A rise in intracellular calcium is a trigger for both (so option D is wrong).

Answer:

the site of calcium binding site differs