Match the vocabulary item with the correct definition. 1. a sensory organ in the muscles that relaxes them in response to static stretching                                                                           a. ballistic stretching 2. stretching that involves no movement during the muscle stretch                                                                           b. antagonistic muscles 3. a sensory organ in the muscles that tightens them in response to sudden movement                                                                           c. muscle spindle 4. stretching which involves gentle, sports-related motions                                                                           d. static stretching 5. stretching which involves forceful bouncing movements                                                                           e. dynamic stretching 6. pairs of muscles that move parts of the body in opposite directions                                                                           f. golgi tendon organ