Stirring it up in your stomach

" The GI tract is a tube through which ingested substances are pushed along for ____________________ and ____________________ processing . "

" The tube walls are made up of an outer ( ? ) ____________________ layer , a ( ? ) ____________________ layer , a supportive ( ? ) ____________________ ____________________ layer , and an inner layer called the digestive ( ? ? ) ____________________ . "

( ? ) ____________________ ____________________ consists of mastication , deglutition , and ( ? ) ____________________ .

The ( ? ) ____________________ is the top of the small intestine .

( ? ? ) ____________________ and ( ? ) ____________________ ____________________ are used to determine the breakdown of food in the stomach .