12. (1)The digestion of food in stomach is carried out by the A present in the wall of the stomach. A releases
B, C, and D. An acidic medium is created by B which facilitates the action of C. The lining of the stomach is
protected from the action of acids by D. What does A, B, C, and D represent?
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Gastric juice contains hydrochloric acid, pepsinogen, and mucus; ingredients important in digestion. Secretions are controlled by nervous (smells, thoughts, and caffeine) and endocrine signals. The stomach secretes hydrochloric acid and pepsin.
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