Which system cleanses the blood and maintains salt and water balance in the body?

The urinary system is responsible for cleansing the blood and maintaining the balance of salt and water in the body. This system includes the kidneys, ureters, bladder, and urethra, and it plays a crucial role in filtering waste products from the blood, regulating electrolytes, and ensuring proper hydration levels. The kidneys specifically filter out excess salts, toxins, and waste products, excreting them as urine while reabsorbing necessary substances back into the bloodstream. This balance is essential for various bodily functions, including blood pressure regulation and overall fluid balance.

In contrast, while the endocrine system regulates numerous body functions through hormones, it does not directly cleanse the blood or manage water and salt balance. The skeletal system provides structure and support to the body but has no role in blood filtration or fluid balance. The nervous system is responsible for transmitting signals throughout the body and does not directly engage in cleansing the blood or managing fluid levels. Therefore, the urinary system stands out as the primary system tasked with these vital functions.