Filtration slits are formed by

Filtration slits are formed by the inner epithelium of Bowman's capsule, which consists of podocytes with foot processes. These tiny gaps between the foot processes allow for the selective filtration of substances from the blood into the Bowman's capsule space during the glomerular filtration process. The presence and proper functioning of filtration slits are essential for maintaining the kidney's ability to filter blood efficiently while preventing the loss of valuable molecules like proteins into the urine.