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The diagram shows the secretions of the pancreas in response to three different substances in chyme. Each pair of bars represents the response of the pancreas to a different variable. Pancreatic juice is composed of _______ bicarbonate in the presence of hydrochloric acid.

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The answer is sodium bicarbonate.

Pancreatic Juice is composed of sodium bicarbonate in the presence of hydrochloric acid. Sodium bicarbonate (NaHCO2) is composed of sodium ions and bicarbonate ions. It acts to neutralize the acid or chyme entering the duodenum.