In this process is known as shivering. So the skeletal muscle is responsible for the process of shivering when it's really cold outside or when we're very sick. Now let's move on to our structure of our skeletal muscle. Now we know that the smallest functional unit of the skeletal muscle is our sarcomere. And the sarcomere consists of thick filaments made up of a protein known as myosin and thin filaments made up of a global protein known as actin. And this is shown in this diagram.