what is villi
ntestinal villi (singular: villus) are tiny, finger-like projections that protrude from the epithelial lining of the intestinal wall. Each villus is approximately 0.5-1 mm in length and has many microvilli (singular: microvillus), each of which are much smaller than a single villus. Intestinal villi should not be confused with the larger folds of mucous membrane in the bowel known as the plicae circulares. A villus is much smaller than a single fold of plicae circulares.
This is done by the digestive juices secreted by the walls of thje stomach which breaks down the proteins into amino acids.There is a probability of bacteria to be present in the food.So, it also secretes Hydrochloric acid , killing the bacteria, if any, and makes the medium of the stomach acidic.if there is excess bacteria in the food, the acid cannot kill all, causing food poisoning.Mucous is also secreted for protecting the lining of the stomach from the Hydrochloric acid.