The video explains how digestion converts large molecules into smaller ones for nutrient absorption. It covers chemical and mechanical digestion, focusing on enzymes as biological catalysts. Carbohydrates, proteins, and lipids are broken down by specific enzymes: carbohydrases, proteases, and lipases. The lock-key model illustrates enzyme specificity. Factors like temperature and pH affect enzyme activity. Metabolism, the sum of all chemical reactions in the body, relies on enzymes to proceed at life-sustaining rates.

What is the function of amylase in carbohydrate digestion?

How do proteases function in the digestion of proteins?

What factors can affect the shape and function of enzymes?