In the oral cavity the main function of sodium bicarbonate is:
Correct answer: B. To stabilize the pH of food
- A. To act as antiseptic
- B. To stabilize the pH of food
- C. To act as lubricant
- D. To make a slimy food
Explanation
Sodium bicarbonate (NaHCO3) is present in saliva. It acts as a mild antiseptic but its major function is to stabilize the pH of the food that we eat. It doesn't have any direct lubricating effect but it has a cleansing action.
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The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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