Which function is NOT performed by the kidneys?

The kidneys perform essential functions related to maintaining homeostasis, including the regulation of electrolyte balance, filtration of waste products, and regulation of blood pressure. However, the storage of urine is not a function carried out by the kidneys themselves. Instead, the storage of urine occurs in the bladder. The kidneys filter blood and produce urine, which then travels down the ureters to the bladder for storage until it is excreted from the body. This distinction clarifies why the storage of urine is not associated with kidney function directly.