Assertion: mitral valve prolapse's flap | /r/HasProperty | held closed
Facets:
value: tightly
type: MANNER
value: by the chordae tendineae
type: OTHER
value: during left ventricular contraction
type: TEMPORAL
value: normally
type: DEGREE
Source sentences:
text: Normally the flaps are held tightly closed during left ventricular contraction (systole) by the chordae tendineae (small tendon "cords" that connect the flaps to the muscles of the heart).