Nick and his family travel to Arizona every summer. With his…

Nick and his family travel to Arizona every summer. With his kids now in their teens, he is more willing to let them go explore the beautiful scenery Arizona offers to its hikers. However, his children weren’t gone more than an hour before he gets a call from the hospital saying his son was bitten by a black widow spider. The venom of the black widow spider causes the release of excessive amounts of ACh, causing convulsions and potentially death. Which step of muscle contraction would not be affected by the increased amount of ACh?