Asher Yatzar Benediction

"Blessed are You, Hashem, our G-d, King of the universe, Who fashioned man with wisdom and created within him nany openings and many cavities. It is obvious and known before Your Throne of Glory that if but one of them were to be ruptured or but one of them were to be blocked it would be impossible to survive and to stand before You. Blessed are You, Hashem, Who heals all flesh and acts wondrously." (Artscroll Siddur - Nusach Ashkenaz, p. 15)

http://www.torah.org/features/firstperson/everythingablessing.html