The urine excretion process takes place in functional units of the kidney called nephrons and involves three primary processes: glomerular filtration, tubular secretion and tubular reabsorption.

• 肾脏中的分泌排泄过程在肾单位中进行。代谢物的尿液排泄包括3个基本过程:肾小球过滤、肾小管分泌和肾小管再吸收。