Question

Humans have innate immunity for protection against pathogens that may enter the gut along with food. What are the two barriers that protect the body from such pathogens?

Answer 1

Microbial pathogens enter the gut of humans along with food: 

 Physical barriers: Mucus coating of the epithelium lining the gastrointestinal tract helps in trapping microbes entering our body. 

 Physiological barriers: Acid in the stomach, saliva in the mouth prevent microbial growth.