Assertion: heart failure's heart | /r/CapableOf | become weak
Facets:
Source sentences:
text: It often occurs if the heart becomes weak or enlarged, which can occur on either side of the heart.
text: The symptoms of CHF come from the heart becoming too weak and not being able to pump enough blood, or from becoming too stiff and causing a “back up” of blood coming from the lungs.
text: Over time, certain heart diseases cause the heart to become too weak or stiff to fill and pump blood efficiently, leading to heart failure.