And this basically means that just like cardiac muscle is involuntary, smooth muscle is also involuntary. And that means we have no way to actually consciously control the movement of smooth muscle. Now, recalling our discussion on skeletal muscle and cardiac muscle, we said that these two types of muscles consist of individual units we call sarcomeres. And these sarcomeres give skeletal and cardiac muscle striations. Now, on the other hand, smooth muscles do not have these triations and that's because they do not consist of these units we call sarcomeres. Instead, throughout the entire smooth muscle cell, we basically have a network of filaments that is responsible for the contraction of that muscle cell as a whole.