The skeletal and muscular systems not only allow us to move and stand tall, but they are also involved in protecting the body, allowing it to grow, and performing subconscious activities such as breathing and the beating of the heart. The heart, an organ made of muscle, distributes blood that lets other systems of the body function. These complex systems work together to achieve many essential bodily functions. In ""The Skeletal and Muscular Systems"", learn how these two systems interact to keep the human body alive and in motion.