Chemistry
The main buffer system of the human blood is

CH3COOH - CH3COO-
NH2CONH2 - NH2CONH+
H2CO3 - CO32-
H2CO3 - HCO3

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Chemistry
Antacid tablets consist of

Hydroxides of sodium and aluminium
Hydroxides of magnesium and sodium
Hydroxides of sodium, magnesium and aluminium
Hydroxides of magnesium and aluminium

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