Factor which increases the GFR are all except:
**Core Concept**
The glomerular filtration rate (GFR) is a critical indicator of kidney function, representing the rate at which the kidneys filter waste products from the blood. Several factors influence GFR, including renal blood flow, glomerular hydrostatic pressure, and the permeability of the glomerular capillary wall.
**Why the Correct Answer is Right**
The correct answer is the factor that decreases the GFR. A decrease in renal blood flow (e.g., due to hypotension or atherosclerosis) reduces the GFR. Similarly, a decrease in glomerular hydrostatic pressure (e.g., due to decreased cardiac output or renal artery stenosis) also decreases the GFR. Additionally, a decrease in the permeability of the glomerular capillary wall (e.g., due to damage to the glomerular basement membrane) reduces the GFR.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided. However, if it were a correct factor increasing GFR, it would be a valid choice.
* **Option B:** This option is not provided. If it were a correct factor increasing GFR, it would be a valid choice.
* **Option C:** This option is not provided. If it were a correct factor increasing GFR, it would be a valid choice.
* **Option D:** This option is not provided. If it were a correct factor increasing GFR, it would be a valid choice.
**Clinical Pearl / High-Yield Fact**
To remember the factors that increase GFR, recall that increases in renal blood flow, glomerular hydrostatic pressure, and the permeability of the glomerular capillary wall all contribute to an increased GFR. However, decreases in these factors lead to a decreased GFR.
**Correct Answer: None.