Which part of the kidney does urine drain into when it leaves the collecting ducts?

When urine leaves the collecting ducts in the kidney, it drains into a part of the kidney known as the renal pelvis. Here are the steps:

1. The nephrons in the kidney filter blood and produce urine. This process involves several parts of the nephron including the glomerulus, proximal convoluted tubule, loop of Henle, and distal convoluted tubule.

2. The urine then moves into the collecting ducts. These are a series of tubules and ducts that connect the nephrons to the ureters.

3. From the collecting ducts, the urine drains into the renal pelvis. The renal pelvis is a funnel-shaped space in the kidney. It's the point where the two or three major calyces join together.

4. The renal pelvis then channels the urine into the ureter, a tube that carries the urine from the kidney to the bladder for storage until it can be excreted from the body.