Question

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what is the role of pepsin?
stimulating the production of insulin
regulating blood pressure
breaking down proteins into smaller peptides
breaking down carbohydrates into smaller monosaccharides
breaking down lipids into smaller fatty acids

Explanation:

Pepsin is an enzyme. Enzymes are biological catalysts. Pepsin is found in the stomach. The stomach's main role in digestion (for proteins). Proteins are large molecules. Enzymes break down substrates. Pepsin's substrate is protein. It breaks proteins into smaller peptides (short - chain amino acids). Insulin production is related to the pancreas (not pepsin). Blood pressure regulation is a function of the cardiovascular and endocrine systems (not pepsin). Carbohydrate breakdown (e.g., by amylase). Lipid breakdown (e.g., by lipase).

Answer:

Breaking down proteins into smaller peptides