Digestion of food in human starts from

Options

A. duodenum
B. small intestine
C. mouth
D. large intestine

Answer

**Step-by-Step Solution:**

1. **Understanding Digestion**: Digestion is the physiological process where larger food molecules are broken down into smaller, absorbable molecules. This process is essential for converting food into forms that can be utilized by the body.

2. **Location of Digestion**: The digestion of food in humans occurs in the alimentary canal, which is a long tube that runs from the mouth to the anus. It includes several organs that play a role in the digestion process.

3. **Starting Point of Digestion**: The digestion of food begins in the mouth, also referred to as the buccal cavity. This is where food is ingested and mechanically broken down.

4. **Role of Saliva**: In the mouth, saliva is secreted, which contains the enzyme amylase. This enzyme begins the chemical digestion of starch, breaking it down into simpler sugars. It is noted that about 30% of starch digestion occurs in the mouth.

5. **Continuation of Digestion**: After the mouth, the food is pushed down the esophagus into the stomach, where protein digestion begins. The process continues into the intestines, where further digestion and nutrient absorption occur.

6. **Conclusion**: Therefore, the digestion of food in humans starts in the mouth (buccal cavity).

**Final Answer**: The digestion of food in humans starts from the mouth (buccal cavity).

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