Subject: How long on AVERAGE does it take a RBC to circulate through the body?

This/your web site for instance says "Nevertheless, on average the blood fully 
circulates in the human body some seven to eight times per minute."  The page is 
at http://www.madsci.org/posts/archives/1998-05/895085485.Gb.r.html     This 
does not coincide with my physiology text, which states there are approximately 
5L of blood in the circulation, during periods of strenuous exercise in well-
trained athletes, cardiac output may reach 35L/min. A simple calculation 
(35L/min)/5L = 7.  SO the number of times the blood fully circulates for an 
average person, not exercising, is FAR lower. My question is can you point to a 
journal or text that verifies what Dr. Frederick Sweet posted, or is he 
mistaken? 

Re: How long on AVERAGE does it take a RBC to circulate through the body?