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 the Context**: Glucose is a vital nutrient that is filtered from the blood into the renal tubules during the process of urine formation. The question asks how glucose is reabsorbed from the glomerular filtrate back into the bloodstream.

2. **Identifying the Site of Reabsorption**: The primary site for the reabsorption of glucose is the proximal convoluted tubule (PCT) of the nephron. This is where most of the glucose is taken back into the blood.

3. **Mechanism of Reabsorption**: The reabsorption of glucose occurs through a specific process. It is important to note that glucose is not passively diffused back into the bloodstream; instead, it is actively transported.

4. **Active Transport Explained**: Active transport is a process that requires energy (usually in the form of ATP) to move substances against their concentration gradient. In the case of glucose, it is reabsorbed from the filtrate in the PCT into the blood capillaries surrounding the nephron.

5. **Role of the Epithelium**: The cells lining the proximal convoluted tubule are specialized for reabsorption. They have a brush border (microvilli) that increases the surface area, facilitating the efficient reabsorption of glucose and other essential nutrients.

6. **Conclusion**: Based on the above points, we can conclude that glucose is taken back from the glomerular filtrate primarily through **active transport**.

### Final Answer:
Glucose is taken back from glomerular filtrate through **active transport**.

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