The lining of the colon is different from the small intestine in that there exists a large number of mucous cells that do not secrete enzymes but rather mucous. The mucous helps protect the wall from the bacterial fermentation inside. About 1.5 L of liquid digestive contents, chyme, pass into the colon.
Cancers are one category of non-communicable diseases that cannot be spread to others. Chicken pox and other conditions caused by viruses are communicable diseases. Non-infectious diseases involving the respiratory system are a class of non-communicable conditions.
Noun. 1. communicable disease-a disease that can be communicated from one person to another. disease-an impairment of health or a condition of abnormal functioning. contagion, contagious disease-any disease easily transmitted by contact. infectious disease-a disease transmitted only by a specific kind of contact.