The fluid that is present in the kidney tubules is known as tubular fluid. In the glomerulus, it begins as renal ultrafiltrate, undergoes nephron compositional change, and then exits the body through the ureters.
The proximal convoluted tubule, the tubule after that that is highly wound, empties into a U-shaped loop that transports the filtered fluid deep inside the medulla and then back into the cortex. Henle's loop refers to this region of the nephron. The proximal convoluted tubule and the collecting duct at the end of the nephron are two locations where tubular secretion takes place.
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