sub:provenance {
  beldoc: dce:description "Approximately 61,000 statements." ;
    dce:rights "Copyright (c) 2011-2012, Selventa. All rights reserved." ;
    dce:title "BEL Framework Large Corpus Document" ;
    pav:authoredBy sub:_4 ;
    pav:version "20131211" .
  sub:_2 dce:identifier "Textbook of Medical Physiology: Chapter 17 Local Control of Blood Flow by the Tissues; and Humoral Regulation" ;
    dce:title "Textbook of Medical Physiology: Chapter 17 Local Control of Blood Flow by the Tissues; and Humoral Regulation" ;
    dce:type "Book" .
  sub:_3 prov:value "Oxygen (and other nutrients as well) is required as one of the metabolic nutrients to maintain vasuclar contraction. Therefore, in the absence of and adequate supply of oxygen or other required vasuclar nutients, it is reasonable to believe that the blood vessels simply would relax and naturally dilate" ;
    prov:wasQuotedFrom sub:_2 .
  sub:_4 rdfs:label "Selventa" .
  sub:assertion prov:hadPrimarySource sub:_2 ;
    prov:wasDerivedFrom beldoc: , sub:_3 .
}