Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Crohn's Disease ?
    ### Response:
    The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anusa 1-inch-long opening through which stool leaves the body. The body digests food using the movement of muscles in the GI tract, along with the release of hormones and enzymes.
    