Glucose, some amino acids and sodium are absorbed in to blood by

Options

A. simple diffusion
B. Active transport
C. Facilitated transport
D. The statement is incorrect since they are absorbed in lymph and not in blood

Answer

**Step-by-Step Solution:**

1. **Understanding Absorption in the Digestive System:**
- The digestive system breaks down food into smaller molecules, which can then be absorbed into the bloodstream. Key nutrients include glucose, amino acids, and sodium.

2. **Mechanism of Absorption:**
- Glucose, amino acids, and sodium are absorbed primarily in the small intestine. The absorption process involves both active and passive transport mechanisms.

3. **Active Transport:**
- Glucose and amino acids are absorbed through a process called active transport. This process requires energy because these molecules are absorbed against their concentration gradient.

4. **Co-Transport Mechanism:**
- The absorption of glucose and amino acids often occurs via a co-transport mechanism with sodium ions. Sodium ions are actively transported out of the intestinal cells into the bloodstream, creating a gradient.

5. **Facilitated Diffusion:**
- Once the sodium concentration is higher outside the cell, sodium ions flow back into the cell through specific transport proteins. This movement helps to bring glucose and amino acids into the cell simultaneously.

6. **Final Absorption into Blood:**
- After entering the intestinal cells, glucose and amino acids are then transported into the bloodstream, where they can be utilized by the body.

**Final Answer:**
Glucose, some amino acids, and sodium are absorbed into the blood by active transport mechanisms, particularly through co-transport with sodium ions.

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