The muscular system in your body is composed of skeletal muscle, cardiac muscle and smooth muscle. Skeletal muscle attaches primarily to your skeleton and moves voluntarily or by reflex. Cardiac muscle is the muscle of your heart and contracts involuntarily. Finally, smooth muscle is found in your blood vessels, eyes, hair follicles and the walls of hollow organs like your stomach and intestines.

the muscular system; it probably seems overwhelming at first, what with all those funky scientific names. There are over 600 skeletal muscles, and that number doesn't even include the smooth muscles! But, like everything else in your body, the muscular system has its own sense of organization. Once you learn a little bit about how it works, it may begin to make a little more sense to you. Even the naming system is organized. Some muscles are named for their location, while others are named for their shape or the direction in which their fibers run. We won't get into all those names in this lesson, but we will get started with some of the basics. As you have probably guessed, the main function of the muscular system is movement, but it also helps stabilize our joints, maintain our posture and generate heat during activity. Movement of our body can be voluntary and controlled by the skeletal muscles, or it can be involuntary and controlled by smooth muscles. Those are found mostly in your internal organs and aid in things like digestion and even eyesight. Skeletal muscles, on the other hand, are what make up what we see a human body do. They move all the different parts of the skeleton. The help us in all kinds of movements, such as walking, swimming, writing and even talking. All this movement is aided by the anatomy and organization of the muscular system. But, before we move on we should mention you do have one other type of muscle in your body. Cardiac muscles are found in the heart and are responsible for the movement of blood through your body.