In an isotonic contraction, the muscle ________. Naim 23:00 Muscles and Muscle Tissue In an isotonic contraction, the muscle ________. A) changes in length and moves the "load" B) does not change in length but increases tension C) never converts pyruvate to lactate D) rapidly resynthesizes creatine phosphate and ATP Answer: A Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+