About half of your body’s weight is muscle. Muscle tissue is categorized into three distinct types: skeletal, cardiac, and smooth. Each type of muscle tissue in the human body has a unique structure and a specific role.Skeletal muscle moves bones and other structures. Cardiac muscle contracts the heart to pump blood.The smooth muscle tissue that forms organs like the stomach and bladder changes shape to facilitate bodily functions.Here are more details about the structure and function of each type of muscle tissue in the human body. 1.ardiac muscle contracts the heart to pump blood. The smooth muscle tissue that forms organs like the stomach and bladder changes shape to facilitate bodily functions. Here are more details about the structure and function of each type of muscle tissue in the human body.