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Question Video: Describing the Role of Pepsin in Gastric Digestion Biology

Which of the following is the correct order of the different stages of digestion? [A] Gastric → buccal → intestinal [B] Intestinal → gastric → buccal [C] Buccal → intestinal → gastric [D] Buccal → gastric → intestinal


Video Transcript

Which of the following is the correct order of the different stages of digestion? (A) Gastric, buccal, intestinal. (B) Intestinal, gastric, buccal. (C) Buccal, intestinal, gastric. Or (D) buccal, gastric, intestinal.

This question asks us to order the different stages of digestion, which is the process that breaks down large molecules from food into smaller useful molecules that can be absorbed and transported to the body cells that require them. Let’s briefly review how the food we eat is digested in order to answer this question correctly.

Digestion begins in the mouth immediately as food is placed into it. The word buccal refers to the mouth itself. And this first stage of digestion is called buccal digestion. Here, food is mechanically digested by the teeth and tongue, physically separating food molecules to give them a larger surface area. And carbohydrates begin to be chemically digested by enzymes in saliva.

Next, food moves from the mouth down the esophagus to the stomach. The word gastric refers to the stomach. And gastric digestion takes place here. The muscular walls of the stomach mechanically digest food, while enzymes begin to chemically digest proteins in food.

From the stomach, food moves into the small intestine, where intestinal digestion occurs. This includes the chemical digestion of carbohydrates, proteins, and lipids, and the subsequent absorption of the smaller molecules that they are broken down into.

Now we have enough information to answer this question correctly. Food moves from the mouth to the stomach then to the small intestine. So the correct answer to our question is (D) buccal, gastric, intestinal.

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