Which of the Following Urine-Making Processes Occurs First

Question

Which of the following urine-making processes occurs first? A) Urine concentration by the collecting ducts B) Glomerular filtration C) Reabsorption of Na⁺ D) Secretion of K⁺

Accepted Answer

Glomerular filtration is the first step in the urine-making process where blood is filtered through the glomerulus in the kidney to produce a filtrate, which ultimately becomes urine. Reabsorption and secretion occur later in the process. Urine concentration by the collecting ducts is also a later step.