Muscles are all made of the same material, a type of elastic tissue (kind of like a rubber material). The thousands, or even tens of thousands, of small fibers arranged every muscle. You have three different types of muscles in your body: smooth, heart, muscle and skeletal. The smooth muscles smooth muscles also sometimes called involuntary muscles are usually in sheets or layers, with a layer of muscle behind the other. You cannot control this kind of muscle. Your brain and body tell these muscles what to do without you even thinking about it. You cannot use their smooth muscles to make a muscle in your arm or jump in the air.

But the smooth muscles are at work everywhere in your body. In your stomach and digestive system, they contract (tighten) and relax to allow food to make your journey through the body. Their smooth muscles come handy if you are sick and you have to vomit. Muscles push the food back from the stomach this then rises through the esophagus and mouth. Smooth muscles are also found in your bladder. When they are relaxed, they allow you to hold in urine (pee) until you can get to the bathroom. Then they collapsed so that you can eliminate urine.

These muscles are also in the uterus of a woman, which is where a baby develops. There they help push the baby from the mother’s body when this is the time for birth. You will find smooth muscles at work behind the scenes in their eyes also. These muscles keep the eyes focused.