Question: in relation to contraction of muscle passive force is defined as
[{'answer': 'tension , which opposes lengthening', 'provenance': [{'wikipedia_id': '1110611', 'title': 'Muscle contraction', 'start_paragraph_id': 40, 'start_character': 714, 'end_paragraph_id': 40, 'end_character': 749, 'bleu_score': 1.0, 'section': 'Section::::Vertebrates.:Skeletal muscle.:Length-tension relationship.\n'}]}, {'provenance': [{'wikipedia_id': '1110611', 'title': 'Muscle contraction', 'start_paragraph_id': 40, 'start_character': 0, 'end_paragraph_id': 40, 'end_character': 867, 'bleu_score': 0.9855586187885531, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2777120870038165115}, 'section': 'Section::::Vertebrates.:Skeletal muscle.:Length-tension relationship.\n'}]}]