Which one of the following pairs of food components in humnas reahces the stomach totally undiagested?

Options

A. Starch and fat
B. Fat and cellulose
C. Starch and cellulose
D. Protein and starch

Explanation

To solve the question of which food components reach the stomach totally undigested, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify which pair of food components does not undergo any digestion before reaching the stomach.

2. **Identify Food Components**: The food components in question are typically carbohydrates (like starch), fats, and fibers (like cellulose).

3. **Digestion in the Mouth**:
- In the mouth, starch begins to be digested by the enzyme salivary amylase. Approximately 30% of starch is broken down into maltose and limit dextrins, while 70% remains undigested.
- Fats do not undergo any digestion in the mouth.

4. **Digestion in the Stomach**:
- The stomach primarily digests proteins through the action of gastric juices, but fats and cellulose remain undigested.
- Cellulose, a type of fiber, is not digestible by humans because we lack the enzyme cellulase.

5. **Conclusion**:
- The components that reach the stomach totally undigested are fats and cellulose.
- Therefore, the correct answer to the question is the pair: **fat and cellulose**.

### Final Answer:
The food components that reach the stomach totally undigested are **fat and cellulose**.

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