Each human kidney contains about 1 million filtering units called nephrons. The nephron has a renal tubule and dilated blind end like a funnel. This dilated funnel like part is called Bowman’s Capsule. It has a tuft of capillaries. The fluid which comes out of these capillaries is filtered by Bowman’s Capsule. The renal tubules do further processing to make 1.5 litres of urine out of 180 litres of filtered fluid in 24 hours.