Question: what is one major function of arrector pili muscle contraction
[{'answer': 'to provide insulation', 'provenance': [{'wikipedia_id': '1918901', 'title': 'Arrector pili muscle', 'start_paragraph_id': 3, 'start_character': 116, 'end_paragraph_id': 3, 'end_character': 137, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1918901', 'title': 'Arrector pili muscle', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 452, 'bleu_score': 0.972407137066537, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8259282791711126232}, 'section': 'Section::::Abstract.'}]}]