Talk:Caval opening

Caval opening constricts during inspiration?

I have read several sources stating that the caval opening constricts during inspiration but also a few which state the the opening widens during inspiration. What are your takes on this?

Sources

http://www.ajronline.org/cgi/reprint/135/2/335.pdf http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1394141/pdf/jphysiol01613-0035.pdf  —Preceding unsigned comment added by 14.202.70.68 (talk) 06:16, 9 April 2011 (UTC)

terminology for caval