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. So to see what we mean, let's take a look at the following diagram. So, this is a diagram of a single smooth muscle cell. We have the membrane shown in black, we have the nucleus shown in blue.