Answer:
The GIT mucus lining of the GIT serve as a physical barrier to the movement of digested food substances.
The mucus also help to prevent inflammation of the bowels; by reducing or suppressing immune response to inflammation.
In Cystic fibrosis, the blockage of the ducts by the mucus, prevents enzymes from reaching the digestive food substances,. The resulting undigested food substances leads to bloating, pain, cramps, gas, smelly belch, constipation, and smelly stools.
Explanation: