Concept:Digestive enzymes act as biological catalysts that speed up digestion.
They convert large food molecules into smaller, absorbable units.
Explanation:Enzymes such as amylase, protease, and lipase break down carbohydrates, proteins, and fats.
These enzymes target specific chemical bonds in the large food particles.
Large molecules like starch, proteins, and lipids are reduced to glucose, amino acids, and fatty acids.
These smaller molecules can then pass through the intestinal wall into the bloodstream.
Digestive enzymes do not absorb nutrients, regulate pH, or transport food along the digestive tract.
Their main role is purely the chemical breakdown of food.
Answer:A. Breaking down food into smaller molecules