ANATOMY

Detailed explanation-1: -The enzyme pepsin is responsible for the digestion of proteins. Pepsin, along with hydrochloric acid, is secreted by the stomach chief cells. Proteins are the most complicated molecules and must be digested further in the small intestine. The digestive juice in the stomach is made up of pepsin and hydrochloric acid.

Detailed explanation-2: -Chemical digestion of protein begins in the stomach and ends in the small intestine. The body recycles amino acids to make more proteins.

Detailed explanation-3: -Protein digestion begins when you first start chewing. There are two enzymes in your saliva called amylase and lipase. They mostly break down carbohydrates and fats. Once a protein source reaches your stomach, hydrochloric acid and enzymes called proteases break it down into smaller chains of amino acids.

Detailed explanation-4: -The body needs protein to maintain and replace tissues and to function and grow. Protein is not usually used for energy. However, if the body is not getting enough calories from other nutrients or from the fat stored in the body, protein is broken down into ketone bodies to be used for energy.

Detailed explanation-5: -Digestion of proteins starts in stomach by the action of gastric juice produced by the walls of the stomach. Digestion of protein also takes place in duodenum and ileum by the action of pancreatic and intestinal juice.