Question: the involuntary movement of smooth muscles is called
[{'answer': 'contraction', 'provenance': [{'wikipedia_id': '300381', 'title': 'Smooth muscle', 'start_paragraph_id': 6, 'start_character': 128, 'end_paragraph_id': 6, 'end_character': 139, 'bleu_score': 1.0, 'section': 'Section::::Structure.\n'}]}, {'provenance': [{'wikipedia_id': '300381', 'title': 'Smooth muscle', 'start_paragraph_id': 48, 'start_character': 0, 'end_paragraph_id': 48, 'end_character': 1136, 'bleu_score': 0.937030134236537, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 589530143411850648}, 'section': 'Section::::Excitation-contraction coupling.:Contraction.\n'}]}]