Final answer:
Yes, pepsin is able to break down proteins into amino acids in the human stomach.
Step-by-step explanation:
Yes, pepsin is able to break down proteins into amino acids in the human stomach. Pepsin is an enzyme that is secreted by the stomach and it plays a crucial role in protein digestion. When protein-rich foods enter the stomach, pepsin and hydrochloric acid work together to denature the proteins and break them down into smaller polypeptides and amino acids. These smaller molecules are then further broken down in the small intestine with the help of other enzymes, ultimately resulting in the absorption of individual amino acids into the bloodstream.