Page 131 - Primary Five Science

2. Pepsin: An enzyme which digests proteins to peptides

3. Rennin: An enzyme that clots milk in breast feeding chil-

dren

4. Mucus: Protects the stomach lining from the corrosive-

ness of hydrochloric acid and digestive enzymes.

Small Intestine

The first part of the small intestines is called the duodenum,

followed by the ileum where digestion is completed.

Duodenum

This is the first section of the small intestine.

The duodenum receives food from the stomach through the

pyloric sphincter muscle. It’s a muscle that controls entry of

food from the stomach into the duodenum.

The duodenum receives digestive juice from 2 accessory or-

gans;

1. Bile juice

 This is produced by the liver, stored in the gall bladder and

flows via the bile duct into the duodenum.

 Bile juice is not an enzyme but contains salts which break

down fats

 Bile emulsifies fats to form tiny droplets (emulsion)

 Bile also neutralises the hydrochloric acid that comes with

the chime from the stomach to provide alkaline conditions

needed in the small intestine.