The main cellular determinants of cardiac automaticity are the hyperpolarization-activated cationic current If. and the electrogenic Na+/Ca2+ exchanger which generates an inward current after each action potential (AP). Our goal was to evaluate their relative role in pacemaking. by means of application of Ivabradine (IVA) (specific If blocker) and Ryanodine (RYA) (known to abolish cal... https://thebrickes.shop/product-category/wood-markers/