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Interlude

Antacids

Adult produces between 2 and 3 L of gastric juice daily.

This juice is a digestive fluid secreted by glands in the
mucous membrane or mucosa that lines the stomach.

Gastric juice contains hydrochloric acid. A simple diagram
of stomach is shown in Figure 16. The inside lining is made

up of parietal cells which are fused together to form tight
junctions. The interiors of the cells are protected from the
surrounding by the cell membranes. These membranes

allow water and neutral molecules to pass in and out of the
stomach, but they usually block the movement of ions such
_
+
+
+
as H , Na , K , and CI ions. In healthy stomach the
concentration of hydrochloric acid in the gastric juice does
not fluctuate greatly.

Figure 16. A simple diagram of stomach
Sumber: Family Health and Medical Library, Vol.9:1556)
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Bahasa Inggris Kimia (PKIM3139) 28