Table schema:
CREATE TABLE table_name_69 (resting_potential__mv_ VARCHAR, ap_duration__ms_ VARCHAR, cell_type VARCHAR)

Question: What was the resting potential with an AP duration of 1.0 and a median giant fiber cell type?
SQL: SELECT resting_potential__mv_ FROM table_name_69 WHERE ap_duration__ms_ = "1.0" AND cell_type = "median giant fiber"