Question

Why are big molecules like starch, proteins and lipids broken down in the digestive system?

Accepted Answer

They are too big to pass through the walls of the digestive system, so digestive enzymes break these big molecules down into smaller ones like sugars, amino acids, glycerol and fatty acids. These smaller, soluble molecules can pass easily through the walls of the digestive system, allowing them to be absorbed into the bloodstream.

Front	Why are big molecules like starch, proteins and lipids broken down in the digestive system?
Back	They are too big to pass through the walls of the digestive system, so digestive enzymes break these big molecules down into smaller ones like sugars, amino acids, glycerol and fatty acids. These smaller, soluble molecules can pass easily through the walls of the digestive system, allowing them to be absorbed into the bloodstream.

Digestive Big Molecules Pass Walls Starch Proteins Lipids