Assertion: yawning | /r/CapableOf | serve to provide more oxygen
Facets:
value: to the blood
type: TRANSITIVE-OBJECT
Source sentences:
text: It was believed for many years that yawning served to provide more oxygen to the blood, and particularly to the brain, although this now appears not to be the case (yawning as a result of high levels of carbon dioxide or low levels of oxygen has been conclusively disproved in many experiments and studies, although the belief is still widespread, even within the medical sector).