Which system regulates fluid balance and filtration of blood?

The renal system, also known as the urinary system, plays a crucial role in regulating fluid balance and the filtration of blood in the body. This system includes the kidneys, ureters, bladder, and urethra, and its primary function is to filter waste products from the blood, maintain electrolyte balance, and regulate blood pressure through the management of fluid volume.

The kidneys filter blood to remove waste, producing urine that contains these waste products alongside excess water and other substances. By adjusting the amount of water and electrolytes that are reabsorbed or excreted, the renal system maintains homeostasis, ensuring that bodily fluids remain in proper balance. Furthermore, the renal system responds to hormonal signals that influence its function, effectively managing hydration levels and blood composition based on the body's needs.

In contrast, the nervous system primarily manages body responses and functions related to stimuli and nerve signals, while the digestive system focuses on food breakdown and nutrient absorption. The endocrine system regulates hormones and metabolic processes but does not have a direct role in fluid filtration or balance like the renal system.