In the kidney, blood is filtered in the cortex, drains through the renal pelvis into the renal medulla, and from there travels in the ureter to the urinary bladder.

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Blood is filtered in the cortex of the kidney, but it drains into the renal pelvis from the medulla, not the other way around. The urine then travels from the renal pelvis to the ureter and into the urinary bladder.

In the Kidney, Blood Is Filtered in the Cortex, Drains