gastrointestinal tract

:  of, relating to, affecting, or including both stomach and intestine

:  a system of body parts or organs that act together to perform some function

:  a bundle of nerve fibers having a common origin, termination, and function

:  an area either large or small: such as

:  a pamphlet or leaflet of political or religious propaganda

:  a piece of writing that is suggestive of such a tract

:  verses of Scripture (as from the Psalms) used between the gradual and the Gospel at some masses (as during penitential seasons)