The stomach wall secretes gastric juice containing three substances F, G and H. One of the functions of F is to kill bacteria which may enter the stomach with food. The substance G protects the inside layer of stomach from the damaging effect of substance F whereas substance H is an enzyme for digestion. The partially digested food then enters into small intestine for further digestion.

(a) What is (i) gland A (ii) substance B, and (iii) enzyme C?

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Solution

(i) Gland A is a salivary gland,
(ii) Substance B is saliva,
(iii) Enzyme C is salivary amylase.

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(i) Gland A is a salivary gland, (ii) Substance B is saliva, (iii) Enzyme C is salivary amylase.

(i) Gland A is a salivary gland,
(ii) Substance B is saliva,
(iii) Enzyme C is salivary amylase.