Digestion is completed in

Options

A. Duodenum
B. Ileum
C. Stomach
D. Cloaca

Answer

**Step-by-Step Solution:**

1. **Understanding Digestion**: Digestion is a complex process that begins in the mouth and continues through the alimentary canal. It involves the breakdown of food into smaller, absorbable components.

2. **Initial Digestion in the Mouth**: The process starts in the mouth where saliva, containing the enzyme salivary amylase, begins to break down starch into maltose and limit dextrins. This accounts for about 30% of starch digestion.

3. **Digestion in the Stomach**: After the mouth, food moves to the stomach. Here, gastric juices help in the digestion of proteins. However, the stomach does not significantly digest fats or carbohydrates.

4. **Completion of Digestion in the Small Intestine**: The majority of digestion occurs in the small intestine, specifically in the duodenum. The duodenum receives secretions from the pancreas (which provides enzymes), the liver (which produces bile), and the gallbladder (which stores bile). These secretions, along with intestinal juice (sucus entericus), facilitate the complete digestion of carbohydrates, proteins, and fats.

5. **Conclusion**: Therefore, digestion is completed in the duodenum of the small intestine.

**Final Answer**: Digestion is completed in the duodenum.

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