Assertion: pacemaker's function | /r/CapableOf | help to regulate the concentration of calcium
Facets:
value: within the cell
type: LOCATION
value: in a process
type: TEMPORAL
Source sentences:
text: The functions of T-tubules include rapidly transmitting electrical impulses known as action potentials from the cell surface to the cell's core, and helping to regulate the concentration of calcium within the cell in a process known as excitation-contraction coupling.