Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Gas in the Digestive Tract ?
    ### Response:
    Gas is air in the digestive tractthe large, muscular tube that extends from the mouth to the anus, where the movement of muscles, along with the release of hormones and enzymes, allows for the digestion of food. Gas leaves the body when people burp through the mouth or pass gas through the anus.
    