<Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> Bowman's capsule (or the Bowman capsule, capsula glomeruli, or glomerular capsule) is a cup - like sack at the beginning of the tubular component of a nephron in the mammalian kidney that performs the first step in the filtration of blood to form urine . A glomerulus is enclosed in the sac . Fluids from blood in the glomerulus are collected in the Bowman's capsule (i.e., glomerular filtrate) and further processed along the nephron to form urine . This process is known as ultrafiltration . The Bowman's capsule is named after Sir William Bowman, who identified it in 1842 . </P> <P> Outside the capsule, there are two "poles": </P> <Ul> <Li> The vascular pole is the side with the afferent arteriole and efferent arteriole . </Li> <Li> The urinary pole is the side with the proximal convoluted tubule . </Li> </Ul>

Which of the following substances is part of the filtrate found in bowman's capsule