Chapter 6 The Muscular System 85 Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. Name ________________________________________________________________ 6. head flexion (neck flexion): no weight needed (Figure 6.2F) A. concentric muscle contraction _ ___________________________________________________________________ __________________________________________________________________ B. antagonist muscle _ ___________________________________________________________________ __________________________________________________________________ 7. foot dorsiflexion (ankle dorsiflexion): no weight needed (Figure 6.2G) A. concentric muscle contraction _ ___________________________________________________________________ __________________________________________________________________ B. antagonist muscle _ ___________________________________________________________________ __________________________________________________________________ Conclusions 1. How were you able to discern which muscle was undergoing concentric contraction during palpation? Which muscle was easiest to feel contract? _ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ _________________________________________________________________________________________________________________ 2. By principle, antagonist and agonist muscles work in opposite directions to produce movements. Describe what might happen if both the agonist and antagonist muscle groups produced concentric contractions at the same time. _ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________ _________________________________________________________________________________________________________________ Figure 6.2F Saskia D. Richter, author Figure 6.2G Saskia D. Richter, author