Answer:
Renal tubular lumen
Explanation:
Tubular secretion is the process where fluid are moved are transfer from the peritubular capillaries to the renal tubular lumen of the kidney by the process of active transport and diffusion. It is the opposite of reabsorption and few substances are secreted in the nephron. Urine is left at reabsorption and secretion has taken place in the nephron.
