CAIE IGCSE Biology 7.4.5 Functions of Hydrochloric Acid Questions

Practise explaining how hydrochloric acid in gastric juice creates the acidic conditions for pepsin activity and helps protect the stomach from swallowed microorganisms.

Exam points

state that hydrochloric acid gives stomach protease/pepsin an optimum acidic pH
explain that stomach acid kills or denatures harmful microorganisms swallowed with food

[Maximum number: 2]

Cells in the lining of the stomach secrete gastric juice, which contains hydrochloric acid and pepsin.

State two roles of hydrochloric acid in the stomach.

1
2

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CAIE IGCSE Biology 7.4.5 Functions of Hydrochloric Acid Questions question 1