Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. 82 Anatomy & Physiology Essentials Lab Manual 2. The quadriceps and hamstring muscles groups are antagonistic of each other. This means that when one muscle group is actively contracting, the other is relaxed to allow for joint movement. However, consider moving from a seated to a standing position. During this motion, the hamstrings are extending the hip while the quadriceps are extending the knee. Why do you think these two antagonistic muscles groups are able to work together in this scenario?_ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ _________________________________________________________________________________________________________________