About: http://webisa.webdatacommons.org/365239504

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Arteries, on the other hand, don???t have or need these valves because of pressure exerted by the heart and other muscles that keeps blood flowing in one direction.
http://www.w3.org/ns/prov#wasQuotedFrom	wisegeek.com