What are the primary functions of the urinary system as described in the chapter?

The primary functions of the urinary system include the regulation of extracellular fluids, removal of waste products from the blood, and maintaining electrolyte balance. The kidneys play a crucial role in filtering blood to form urine, which is then stored in the bladder before excretion.

The urinary system consists of the kidneys, ureters, urinary bladder, and urethra. Its main function is to regulate the composition and volume of extracellular fluids, particularly plasma and tissue fluid. The kidneys filter waste products from the blood, including nitrogenous wastes, and help maintain electrolyte balance, which is vital for bodily functions. Additionally, the kidneys secrete the hormone erythropoietin, which stimulates red blood cell production when oxygen levels are low.