Concentration of GF in AL of Henle's loop during transport

Options

A. Decreases
B. Increases
C. Unchanged
D. None of these

Answer

### Step-by-Step Solution:

1. **Understanding Glomerular Filtration Rate (GFR)**:
- GFR refers to the rate at which blood is filtered through the kidneys, specifically how much blood is filtered per minute. It is a crucial indicator of kidney function.

2. **Identifying the Structure**:
- The term "AL" refers to the Ascending Loop of Henle, which is a part of the nephron in the kidney. The nephron is the functional unit of the kidney responsible for filtering blood and forming urine.

3. **Reabsorption in the Nephron**:
- The nephron consists of several segments, including the Proximal Convoluted Tubule (PCT), the Loop of Henle (which includes the descending and ascending limbs), and the Distal Convoluted Tubule (DCT).
- The PCT and DCT are known for their high rates of reabsorption of substances such as water, ions, and nutrients.

4. **Function of the Ascending Loop of Henle**:
- The Ascending Loop of Henle primarily reabsorbs sodium and chloride ions but is impermeable to water. This means that while ions are actively transported out, water does not follow, leading to a decrease in the concentration of the filtrate.

5. **Conclusion on GFR in the Ascending Loop of Henle**:
- Since the Ascending Loop of Henle does not reabsorb water and primarily focuses on ion transport, the concentration of glomerular filtrate (GF) decreases as it moves through this segment.
- Therefore, the correct answer to the question regarding the concentration of GF in the Ascending Loop of Henle during transport is that it **decreases**.