Assertion: worm's end | /r/HasProperty | enlarged with muscle
Facets:
value: to form a heart
type: PURPOSE
value: in some annelids
type: TEMPORAL
Source sentences:
text: In some annelids the forward end of the upper blood vessel is enlarged with muscles to form a heart, while in the forward ends of many earthworms some of the vessels that connect the upper and lower main vessels function as hearts.