What is the primary function of the urinary system?

The primary function of the urinary system is to cleanse the blood and rid the body of wastes. This system is responsible for filtering out harmful substances from the bloodstream, including excess salts, toxins, and metabolic waste products, and excreting them through urine. The kidneys, which are a crucial part of the urinary system, perform this filtration process, ensuring that the body maintains homeostasis by balancing electrolytes and fluids.

By removing waste products, the urinary system plays a vital role in preventing the accumulation of harmful substances that could lead to toxicity or other health issues. Additionally, this system contributes to regulation of blood pressure, electrolyte balance, and acid-base homeostasis, all of which are essential for overall health.

Other options relate to entirely different body systems and functions. For instance, regulating body temperature pertains to the integumentary system and thermoregulation, supporting the skeletal system involves maintaining structure and movement, and facilitating respiration is the primary function of the respiratory system. Each of these options addresses distinct physiological processes that do not encompass the direct role of the urinary system in waste management.