Glucose is transported to cell by:

Options

A. `Na^(+)` symport
B. `K^(+)` symport
C. `Na^(+)` Antiport
D. `K^(+)` Antiport

Answer

**Step-by-Step Solution:**

1. **Understanding Glucose Transport**: Glucose is primarily absorbed in the small intestine and needs to be transported into the cells for utilization.

2. **Role of Sodium**: In the process of glucose absorption, sodium ions play a crucial role. They are co-transported with glucose into the epithelial cells of the intestinal villi.

3. **Sodium-Glucose Co-Transporter**: The specific mechanism for glucose transport is through a sodium-glucose co-transporter (SGLT). This transporter allows glucose to enter the cell along with sodium ions.

4. **Energy Requirement**: The transport of glucose is indirectly dependent on ATP because the sodium gradient is maintained by the sodium-potassium ATPase pump. This pump uses ATP to move sodium out of the cell and potassium into the cell, creating a concentration gradient that drives the co-transport of glucose.

5. **Final Transport to Bloodstream**: Once inside the epithelial cell, glucose is then transported into the bloodstream via another transporter known as GLUT (Glucose Transporter), which facilitates the movement of glucose from the cell into the blood.

6. **Conclusion**: Based on the above mechanisms, the correct answer to the question "Glucose is transported to cell by:" is the sodium symporter.

**Final Answer**: Glucose is transported to the cell by sodium symporter.

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