Webmaster Speaking --- about the following:

ALERT:    I found a way to add a video to cover the subject in the website below;
but, I can see from what I've learned now that it is Here -- that, after the
immediate subject is covered, you are led to YOU TUBE -- I've never
been at a YOU TUBE site.   Be careful to "stick" to the selection of
other videos that  relate to our subject -- Or you will get into all sorts
of "things"   --- That is not our intent!  BE CAREFUL!

HOW THE  GASTROINTESTINAL SYSTEM WORKS