The hydrostatic pressure in glomerular capillaries is the chief force pushing water and solutes out of the blood and across the filtration membrane.

• A. False
• B. True

Answer: (B)

Verified step by step guidance

1. Understand the concept of hydrostatic pressure: Hydrostatic pressure is the force exerted by a fluid due to gravity. In the context of the glomerular capillaries, it refers to the pressure exerted by the blood within these capillaries.
2. Identify the role of hydrostatic pressure in the kidneys: In the kidneys, hydrostatic pressure in the glomerular capillaries is crucial for the process of filtration. It is the primary force that drives water and solutes out of the blood and into the Bowman's capsule, initiating urine formation.
3. Examine the filtration membrane: The filtration membrane consists of the glomerular endothelium, the basement membrane, and the podocytes. Hydrostatic pressure pushes water and solutes across this membrane from the blood into the nephron.
4. Consider the balance of pressures: While hydrostatic pressure is the chief force, it is important to note that other pressures, such as osmotic pressure and capsular hydrostatic pressure, also play roles in the filtration process. However, hydrostatic pressure is the dominant force.
5. Conclude the statement's accuracy: Given the role of hydrostatic pressure in driving filtration, the statement that it is the chief force pushing water and solutes out of the blood and across the filtration membrane is indeed true.