Glomerular capillary pressure differ from other capillaries of body in:
**Core Concept**
Glomerular capillary pressure is a critical determinant of renal function, particularly in the context of glomerular filtration rate (GFR). The unique anatomy of the glomerulus, characterized by a high surface area and specialized capillary structure, contributes to its distinct hemodynamic properties.
**Why the Correct Answer is Right**
Glomerular capillary pressure is higher than other capillaries due to the presence of a narrow glomerular efferent arteriole, which increases resistance and maintains a higher pressure within the glomerulus. This allows for efficient filtration of waste products and excess fluids from the blood. The high pressure is also attributed to the high oncotic pressure generated by the large surface area of the glomerular capillaries.
**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because glomerular capillary pressure is not primarily determined by the radius of the capillaries.
**Option B:** This option is incorrect as the glomerular capillary pressure is not directly influenced by the number of capillaries.
**Option C:** This option is incorrect because the glomerular capillary pressure is not solely determined by the viscosity of blood.
**Clinical Pearl / High-Yield Fact**
Remember that the glomerular capillary pressure is a critical determinant of the glomerular filtration rate (GFR), and any alterations in this pressure can significantly impact renal function.
**Correct Answer:** C.