So the contraction of the thin and thick filaments causes our dense bodies to move closer, which causes the shortening of intermediate filaments found throughout the entire cell. And since some of these filaments are connected to the membrane of the cell, what it ultimately causes is the contraction and the shrinking of the entire cell as a whole. So basically, it contracts in the following fashion. Now, there are two main types of arrangements of our muscle cells inside the human body. One of these arrangements is known as the single unit smooth muscle, also known as the visceral smooth muscle. And the other type of arrangement is known as the multi unit smooth muscle arrangement.