Which one of the following statements is true regarding digestion and absorption of food in humans?

Options

A. Oxytocin cells in our stomach secrete the proenzyme pepsinogen
B. About 60% of starch is hydrolyzed by salivary amylase in our moth
C. Chylomicrons are small lipoprotein particles that are transported from intestine into blood capillaries
D. Fructose and amino acids are absorbed through intestinal mucosa with the help of carrier ions like `Na^+`

Answer

To determine which statement is true regarding digestion and absorption of food in humans, let's analyze each option step by step.

### Step 1: Understand Digestion and Absorption
- **Digestion** is the process of breaking down food into simpler substances.
- **Absorption** is the process of taking up nutrients from the digested food into the bloodstream.

### Step 2: Evaluate Each Statement
1. **Statement 1**: "Oxytocin cells in our stomach secreted coenzyme pepsinogen."
- **Analysis**: This statement is incorrect. The cells that secrete pepsinogen are called chief cells, not oxytocin cells (which are actually involved in hormone secretion). Therefore, this statement is false.

2. **Statement 2**: "60% of starch is hydrolyzed by salivary amylase in our mouth."
- **Analysis**: This statement is also incorrect. Salivary amylase only hydrolyzes about 5% of starch in the mouth, not 60%. Thus, this statement is false.

3. **Statement 3**: "Chylomicrons are small lipoprotein particles that are transported from intestine into blood capillaries."
- **Analysis**: This statement is misleading. While it is true that chylomicrons are small lipoprotein particles, they are not transported directly into blood capillaries. Instead, they enter the lymphatic system and then into venous circulation. Therefore, this statement is false.

4. **Statement 4**: "Fructose and amino acids are absorbed through intestinal mucosa with the help of carrier ions like sodium."
- **Analysis**: This statement is true. Fructose and amino acids are absorbed through the intestinal mucosa with the help of carrier ions such as sodium, utilizing facilitated transport mechanisms. Hence, this statement is true.

### Conclusion
The only true statement regarding digestion and absorption of food in humans is **Statement 4**: "Fructose and amino acids are absorbed through intestinal mucosa with the help of carrier ions like sodium."

### Final Answer
The correct answer is **Statement 4**.

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