All of your involuntary muscles are not controlled by us. Well, technically, they are. They are just controlled by areas of our brains that only our sub-conscience has control over. These enclude musles such as our hearts, etc. However, any muscle can be used out of our state of mind's control through reflexes. For example, when you touch a hot stove, your sub-conscience, not your state of mind, quickly takes your hand off for you.