Assertion: pacemaker's rate | /r/HasProperty | proportional
Facets:
value: directly
type: MANNER
Source sentences:
text: There are two important corollaries to this statement: (1) the rate of change of transmembrane voltage is directly proportional to the net current across the membrane; and (2) transmembrane voltage is stable (ie, unchanging) only when there is no net current across the membrane.