Assertion: vein's valve | /r/HasProperty | important
Facets:
value: especially
type: DEGREE
value: in legs
type: LOCATION
value: in the arms
type: LOCATION
value: in aiding in venous return
type: TEMPORAL
Source sentences:
text: Because blood pressure is normally low in veins, these valves are important in aiding in venous return by preventing the backflow of blood (which is especially true in the upright individual).
text: Venous valves are especially important in the arms and legs, where they prevent the backflow of blood in response to the pull of gravity.