Overview. Although you have more than 600 muscles in your body, there are only three types of muscle: smooth, cardiac and skeletal. Each muscle helps to keep you in motion, your heart beating or signal a natural response in your body, such as the ability to keep your eyes focused.ther examples of smooth muscle include the uterus, the bladder and the muscle behind the eyes that keeps your eyes focused. In terms of appearance, smooth muscles are long, thin-shaped cells attached to bones in the body. Smooth muscles are also found in the blood vessels, helping blood to move around the body.