Pacemaker Potential: Cardiac
Potassium channels which open during _____ are now ____.
F-Type (funny) Channels are open, when stimulated by a _____ charge. _ and _ pass through but _ inflow exceeds _ outflow. As voltage change moves towards threshold, the Na channels ____ and some __ channels open briefly continuing the depolarization.
Ca+ T-Type Channels open at ______ of ______ _____ when threshold of _____ is met, many Ca+ ____-__ channels open ________ occurs and AP is produced.
L-Type Ca channels close at peak and slow K+ channels open. Repolarization due to outflow of K+. Ca+ is also pumped into S.R or ECF. When K+ channels close, the cycle starts again.
Repolarization / Closing
- Negative / K+ and Na+
- but Na+ inflow exceeds K+ outflow.
- Close / Ca+
- Middle of Pacemaker potential
- -40mV / Type-L