Glomerular filtration

Definition

Glomerular filtration is the process by which the kidneys filter blood, removing excess wastes and fluids to form urine. It occurs in the glomeruli, where blood pressure forces water and solutes through a filtration barrier into Bowman's capsule.

5 Must Know Facts For Your Next Test

1. The glomerular filtration rate (GFR) is a key indicator of kidney function and health.
2. The filtration barrier consists of fenestrated capillaries, a basement membrane, and podocytes.
3. Approximately 180 liters of fluid are filtered by the glomeruli each day, but most of it is reabsorbed.
4. Blood components such as cells and large proteins are typically not filtered due to their size.
5. Filtration is driven by hydrostatic pressure in the glomerular capillaries.

Review Questions

Related terms

Bowman's Capsule: A cup-like sac at the beginning of the nephron that encases the glomerulus and collects filtrate.

Podocytes: Specialized cells with foot-like extensions that wrap around capillaries in the glomerulus to form part of the filtration barrier.

Hydrostatic Pressure:

The force exerted by a fluid against a wall, crucial for driving substances through the glomerular filtration barrier.