Cambridge O Level Biology · Syllabus 5090 · Excretion
Glomerular Filtrate
What is Glomerular Filtrate?
The fluid formed inside the Bowman's capsule after filtration, containing water, glucose, urea and ions but no blood cells and no large plasma proteins. Filtrate has the same composition as blood plasma except that the large plasma proteins have been left behind, because filtration separates purely by molecular size. Filtrate is not urine: it still contains all the glucose that was in the blood, and it becomes urine only after selective reabsorption has returned the useful substances to the blood.
This definition is part of the Excretion chapter in Cambridge O Level Biology.
Glomerular Filtrate in context
Glomerular filtrate has the same composition as blood plasma except that the large plasma proteins have been left behind. Everything else that was dissolved in the plasma — water, glucose, ions and urea — passes into the capsule.