The renal artery brings blood from the circulatory system to be filtered by the kidney. The process starts when plasma leaks out of which structure?

Blood plasma is filtered from the glomerulus into the nephron at the start of urine formation. The glomerulus is a bundle of tiny blood vessels inside the kidney’s filtering unit; the nephron receives the filtered fluid. The renal vein carries blood away from the kidney, and the renal medulla is an inner region of the kidney, so neither is where filtration begins.

AI-written and checked against the verified answer.