In which structure is the filtrate collected?

The filtrate is collected in the renal pelvis.

The kidneys are responsible for filtering waste products from the blood and producing urine. The urine is then transported from the kidneys to the bladder through the ureters. The renal pelvis is a funnel-shaped structure that connects the ureters to the kidneys. The urine is collected in the renal pelvis before it is transported to the bladder.