Assertion: heart murmur's heart | /r/CapableOf | beat in two sounds
Facets:
value: normally
type: DEGREE
Source sentences:
text: Normally the heart beats in two sounds: the first is a 'lub' like sound, caused by the mitral and tricuspid valves closing at the beginning of the systole, and the second is a 'dub' like sound, caused by the aortic and pulmonary valves closing at beginning of the diastole.