The three main types of muscles in the human body are skeletal, cardiac, and smooth muscles. Skeletal muscles are under voluntary control and facilitate movement by connecting to bones. Cardiac muscle makes up the heart and is responsible for pumping blood, operating involuntarily. Smooth muscles are found in hollow organs, such as the intestines and blood vessels, and control involuntary functions like digestion and circulation. Each type plays a vital role in maintaining the body’s overall functionality and health.