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.
Hiv a Communicable Disease HIV: A Communicable Disease HIV, Human Immunodeficiency Virus, is a communicable disease... that was once considered a death sentence years ago. It is a disease that is contracted by the exchange of bodily fluids such as blood, semen, and vaginal secretions.