Actin filaments are part of the contractile machinery in smooth muscle cells of eukaryotic organisms. which organelle is responsible for contractile movement in these cells? endoplasmic reticulum nucleus plasma membrane cytoskeleton

The interaction of motor proteins such as dynein, is responsible for the movement of organelles in cells which uses energy to move parts of the cytoskeleton.  Cytoskeleton is a network of intermediate filaments, microtubules and microfilaments that outspread throughout the cytoplasm and serve a variety of signaling, transport and mechanical functions.

The answer is b. hope this !

2hydrogen and 1 covalent