Assertion: pacemaker's action potential | /r/CapableOf | spread to both atria
Facets:
Source sentences:
text: The action potential starts in the SA node and spreads to both atria, causing a contraction.
text: The sinoatrial (SA) node, located in the upper wall of the right atrium, initiates the cardiac cycle by generating an action potential that spreads through both atria through the gap junctions of the cardiac muscle fibers.