Question: which part of the neuron undergoes graded potentials
[{'answer': 'membrane', 'provenance': [{'wikipedia_id': '563188', 'title': 'Graded potential', 'start_paragraph_id': 1, 'start_character': 33, 'end_paragraph_id': 1, 'end_character': 41, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '563188', 'title': 'Graded potential', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 348, 'bleu_score': 0.9603762111511761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15310460217916341914}, 'section': 'Section::::EPSPs.\n'}]}]