A person has a GFR of 120 mL/min and passes 1.5 L of urine in a day…

Urine forms by filtration, reabsorption and secretion. The glomerular filtration rate (GFR) is about $125$ mL/min, which is $180$ L a day. About $99\%$ of the filtrate is reabsorbed, and about $1.5$ L of urine is passed. The PCT takes back all the essential nutrients and $70$ to $80\%$ of the electrolytes and water. The kidneys receive $1100$ to $1200$ mL of blood a minute. The tubule secretes H$^+$, K$^+$ and ammonia.