Course Content
NUTRITION IN PLANTS AND ANIMALS
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Biology Form 1
About Lesson

Components and Functions of Gastric Juice

(i) Hydrochloric acid

(ii) Pepsinogen

(iii) Rennin

(iv) Mucus

 

Hydrochloric acid

  • Provides an acidic medium for enzyme action.
  • Kills the bacteria that may be present in the food.
  • Activates pepsinogen to pepsin.

Pepsinogen

Pepsinogen is activated to pepsin. Pepsin breaks down proteins into peptides.

Pepsin is secreted in its inactive form pepsinogen (to prevent it from digesting the cells that secrete it).

Rennin

Digests the milk protein caseinogen (soluble) into casein (insoluble).

It is abundant in suckling young children.

Mucus

Protects the stomach walls against corrosion by hydrochloric acid and digestion by proteolytic enzymes.

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