Question

List and desribe three pressures operating at the filtration membrane , and explain how each influences net filtration pressure:

1.

2.

3.

Answer 1

The Three pressures operating at the filtration membrane are-

1. Glomerular hydrostatic pressure

2. Colloid osmotic pressure of glomerular blood

3.Capsular Hydrostatic Pressure

Net Filtration Pressure=Glomerular hydrostatic pressure-[Colloid osmotic pressure of glomerular blood + Capsular Hydrostatic Pressure]

**Glomerular hydrostatic pressure-- This is the Pressure exerted by fluid on the walls of the glomerulus.

As Glomerular hydrostatic pressure Increases Net filtration pressure also increases.

**Colloid osmotic pressure of glomerular blood-- This is pressure induced by proteins(Mostly albumin).

This pressure draws water into the glomerulus.

As Colloid Osmotic Pressure Increases Net filtration pressure Decreases.

**Capsular Hydrostatic Pressure-- This is the mechanical pressure exerted by the elastic recoil of the glomerular capsule, that tries to push water back to glomerular capilleries.

So,as Capsular Hydrostatic Pressure Increases Net filtration pressure decreases.