Question: which part of the cardiac cycle represents the pumping of the heart muscle
[{'answer': 'systole', 'provenance': [{'wikipedia_id': '2525843', 'title': 'Cardiac cycle', 'start_paragraph_id': 1, 'start_character': 305, 'end_paragraph_id': 1, 'end_character': 312, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2525843', 'title': 'Cardiac cycle', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 783, 'bleu_score': 0.865511622207016, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8177274187466899278}, 'section': 'Section::::Abstract.'}]}]