What is the function of pepsin in the digestive system?

Pepsin functions as a protein-digesting enzyme in the digestive system. It is produced in the stomach and plays a crucial role in the breakdown of proteins into smaller peptides. This process is essential because proteins must be broken down into their constituent amino acids in order to be absorbed by the body for various physiological functions, including growth, repair, and energy production.

Pepsin is activated from its inactive form, pepsinogen, in the acidic environment of the stomach, which is maintained by gastric acid (hydrochloric acid). The acidic pH not only allows for the activation of pepsinogen but also creates an optimal environment for pepsin to function effectively, promoting the cleavage of peptide bonds in protein molecules.

In summary, the role of pepsin as a protein-digesting enzyme is fundamental to the digestive process, facilitating the initial steps of protein digestion that are vital for nutrient absorption and overall metabolism.