Substance that is absorbed by facilitated transport into blood is

Options

A. Fructose
B. All amino acids
C. Glucose
D. Glycerol

Answer

To solve the question regarding which substance is absorbed by facilitated transport into the blood, we will follow these steps:

### Step-by-Step Solution

1. **Understanding Facilitated Transport**:
- Facilitated transport is a process that allows substances to cross membranes with the help of special proteins, without the need for energy. This process typically occurs along the concentration gradient (from higher to lower concentration).

2. **Identifying the Substances**:
- The question provides four options: fructose, all amino acids, glucose, and glycerol. We need to determine which of these substances is absorbed by facilitated transport.

3. **Analyzing Each Option**:
- **Fructose**: Fructose is a simple sugar that can be absorbed by facilitated diffusion through specific transporter proteins in the intestinal mucosa.
- **All Amino Acids**: Amino acids are typically absorbed through active transport mechanisms rather than facilitated diffusion.
- **Glucose**: Glucose is also absorbed through active transport (via the sodium-glucose transporters) rather than facilitated diffusion.
- **Glycerol**: Glycerol can diffuse passively but is not primarily absorbed through facilitated transport.

4. **Conclusion**:
- Based on the analysis, fructose is the only substance among the options that is absorbed by facilitated transport into the blood. It utilizes specific transporter proteins (like GLUT2) to cross the intestinal membrane.

### Final Answer
The substance that is absorbed by facilitated transport into blood is **fructose**.

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