白城师范学院生物系 兴奋后兴奋性变化: ●有效不应期( effective refractory period,RP) (200~400ms) ●相对不应期( relative refractory period RRP 超常期( supernormal period) ●低常期( subnormal period)白城师范学院生物系 兴奋后兴奋性变化: ●有效不应期(effective refractory period, ERP) (200~400ms) ●相对不应期(relative refractory period RRP) ●超常期(supernormal period) ●低常期(subnormal period)