Which of the following are absorbed in the alimentary canal as such?

Options

A. Albumen of egg
B. Polysaccharides
C. Fat soluble vitamins
D. Proteins

Answer

To determine which substances are absorbed in the alimentary canal as such, we need to analyze the options provided. Here’s a step-by-step solution:

### Step 1: Understand the Question
The question asks which substances can be absorbed in the alimentary canal without any prior digestion or breakdown.

**Hint:** Focus on substances that do not require enzymatic breakdown for absorption.

### Step 2: Identify the Options
Typically, the options may include substances like:
- Fat-soluble vitamins
- Proteins (like albumin from egg)
- Polysaccharides
- Simple sugars

**Hint:** Think about the nature of each substance and whether they can be absorbed directly.

### Step 3: Analyze Each Option
1. **Fat-soluble vitamins:** These vitamins (A, D, E, K) are absorbed in their intact form through the intestinal mucosa. They enter the intestinal cells via micelles and are then packaged into chylomicrons for transport into the lymphatic system and bloodstream.

**Hint:** Remember how fat-soluble vitamins are absorbed and their mechanism.

2. **Proteins (like albumin):** Proteins must be broken down into amino acids or small peptides before they can be absorbed. They cannot be absorbed in their intact form.

**Hint:** Consider the digestion process of proteins.

3. **Polysaccharides:** These complex carbohydrates must be broken down into simpler sugars (monosaccharides) before absorption. They cannot be absorbed as polysaccharides.

**Hint:** Think about how carbohydrates are digested.

4. **Simple sugars:** These can be absorbed directly as they do not require further breakdown.

**Hint:** Identify which sugars can be absorbed without further digestion.

### Step 4: Conclusion
After analyzing the options, we find that:
- **Fat-soluble vitamins** are absorbed as such.
- **Proteins** and **polysaccharides** need to be broken down before absorption.
- **Simple sugars** can also be absorbed directly.

Thus, the only correct answer to the question is **fat-soluble vitamins**.

### Final Answer
**Fat-soluble vitamins are absorbed in the alimentary canal as such.**