NURSING ANM AND GNM

Detailed explanation-1: -There are, in fact, no fast Na+ channels and currents operating in SA nodal cells. This results in slower action potentials in terms of how rapidly they depolarize. Therefore, these pacemaker action potentials are sometimes referred to as “slow response” action potentials.

Detailed explanation-2: -Abstract. The secondary inward current that flows through the slow channel is probably carried primarily by calcium ions. This current is responsible, in part, for the plateau phase of the cardiac action potential.

Detailed explanation-3: -The electrical signal travels from the sinoatrial node (SAN), which stimulates the atria to contract, to the atrioventricular node (AVN) which slows down conduction of the action potential, from the atria to the ventricles. This delay allows the ventricles to fully fill with blood before contraction.