Enzymes in Digestion
Science: KS3, topic 1.4.12
Enzymes in Digestion
Digestive enzymes are produced by specialised cells (perform a specific function) in the glands and the lining of the gut. They are then secreted (released) out of the body cells and into the cavity of the digestive system. Digestive enzymes are used to:
Breakdown large food molecules
- The digestive enzymes catalyse (speed up) the breakdown of large, insoluble food molecules into smaller, soluble (can be dissolved) molecules that are then small enough to be absorbed into the bloodstream.
- Digested molecules can be used to construct new carbohydrates, proteins and lipids in the body.
- Some glucose produced by digestion is used for respiration.
Enzymes in digestion
- The 3 main digestive enzymes are:
- Amylase
- Protease
- Lipase
Test yourself on Enzymes in Digestion
Why is it necessary to break down large, insoluble food molecules into smaller, soluble molecules?
Why do digestive enzymes break down large, insoluble food molecules into smaller, soluble molecules?
Why must large, insoluble food molecules be broken down before they can enter the bloodstream?
What would most likely happen to the body's energy supply if the digestive system stopped producing enzymes?