Glucose is taken back from glomerular filtrate through

Options

A. Active transport
B. Passive transport
C. Osmosis
D. Diffusion

Answer

### Step-by-Step Solution:

1. **Understanding Glomerular Filtrate**:
- Glomerular filtrate is the fluid that is filtered from the blood in the glomeruli of the kidneys. It contains water, ions, glucose, amino acids, and waste products.

2. **Location of Reabsorption**:
- The reabsorption of glucose from the glomerular filtrate primarily occurs in the **Proximal Convoluted Tubule (PCT)** of the nephron.

3. **Mechanism of Glucose Reabsorption**:
- Glucose is reabsorbed from the filtrate back into the blood through a process known as **active transport**. This means that glucose is moved against its concentration gradient, which requires energy.

4. **Role of ATP**:
- The energy for active transport comes from **ATP (Adenosine Triphosphate)**. This energy is necessary to transport glucose molecules from the filtrate into the cells lining the PCT.

5. **Comparison with Other Transport Mechanisms**:
- Passive transport mechanisms such as diffusion and osmosis do not apply here because they rely on concentration gradients. In the case of glucose, it is actively transported against its gradient, making passive transport unsuitable.

6. **Conclusion**:
- Therefore, the correct answer to the question is that glucose is taken back from the glomerular filtrate through **active transport** in the Proximal Convoluted Tubule.