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When at the end of a sinoatrial action potential the membrane repolarizes below the If threshold (about -40/-50 mV), the funny current is activated and supplies inward current, which is responsible for starting the diastolic depolarization phase. — “Funny current - Wikipedia, the free encyclopedia”, en.wikipedia.org
E-4031 is an experimental class III antiarrhythmic drug that blocks potassium channels of hERG channels (Kv11.1) mediate the IKr current, which repolarizes the myocardial cells. The hERG channel is encoded by ether-a-go-go related. — “E-4031 - Wikipedia, the free encyclopedia”, en.wikipedia.org
Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. These channels remain inactivated until the membrane repolarizes, after which they close, reactivate and regain their ability to close in response to. — “Refractory period (physiology) - Wikipedia, the free encyclopedia”, en.wikipedia.org