smooth muscle

Smooth muscles, sometimes known as involuntary, often arranged in layers or sheets, one above the other. You can not control the movements of this kind of muscles. The brain and body to tell them these muscles what to do without you even have to think about it. You can not use the smooth muscles to "ball" with the arm or jump into the air. But you have smooth muscles to function throughout the body. In the stomach and digestive system, contract (tighten) and relax to help the food to move through your body. Smooth muscles also get down to work when you are ill and need to vomit. These muscles push the food leaves the stomach for it, climb up the esophagus and exit through the mouth. 

You also have smooth muscles in the bladder. When you are relaxed, these muscles allow you to hold urine (the pee) until you go to the toilet. And when they are incurred, expel urine. These muscles are also found in the uterus of women, which is where the baby before birth. The muscles of the uterus to help expel the baby out of the body of the mother during childbirth. 

You also have smooth muscles hidden behind the eyes. These muscles help you focus when you order something.