saliva,enzymes,hydrochloric acid solution, and mucus.
The stomach (part of the digestive system) has a low pH (acidic), which kills pathogens.
The immune system
through the digestive system.
Yes.
An immune response is part of the body's defense against pathogens in which cells of the immune system react to each kind of pathogen with a defense targeted specifically toward that pathogen.
True pathogens can cause illness in a completely healthy person. They will cause sickness in a normal, uncompromised immune system.
The body system that the colon belongs to is the digestive system. The colon is also known as the large intestine.
Your immune system defends against STD's with structural defenses like gastric juices and the mucus linings. For more info on the parts of the immune system follow the related question.
The mouth and anus
An individual is exposed to a killed pathogen, an inactivated pathogen, or a component of a pathogen. The individual is protected from subsequent exposures to the pathogen because the adaptive immune system is stimulated to produce memory B cells and memory T cells, which protect from subsequent exposures.
The Gullet Is Part Of The Digestive System
protects cells that have not yet been infected by viruses