It contains the origin, this is the distal end, it contains our insertion. Now of course, we actually have the joints that allow the movement of these bones with respect to each other. So we have the joint that connects our humerus to our shoulder bone, the flat bone known as the scapula, and we have the joint in our elbow as shown. Now, one of these muscles is known as an agonist, the other muscle is known as an antagonist. And these roles basically change with respect to the type of motion that we are actually creating. And we'll see what that means in just a moment.