Micrograph of Glomerulus

Glomerulus
Key:
  • AA- afferent arteriole
  • EA- efferent arteriole
  • BC- Bowman's capsule
  • US- urinary space
  • TP- tubular pole- first part of collecting system
As blood passes through the glomerulus from the afferent arteriole, the plasma is filtered through a very fine physical mesh created by podocyte cells. This filtration process is entirely pressure- and osmotically- driven, with no active transport involved at this stage.