Assertion: vein | /r/CapableOf | work against gravity
Facets:
value: to get blood
type: PURPOSE
value: to do this
type: PURPOSE
Source sentences:
text: To return blood to your heart, the veins in your legs must work against gravity.
text: To return blood to your heart, the veins in your legs must work against gravity.
text: The veins in your legs must work against gravity to do this.
text: Because veins have to work against gravity to get blood back to the heart, contraction of skeletal muscle assists with the flow of blood back to the heart.