What is the primary function of the urinary system in animals?

The primary function of the urinary system in animals is to remove waste products from the blood and regulate fluid balance. The kidneys play a central role in this process by filtering the blood, eliminating waste products such as urea, creatinine, and excess ions, while also managing the body's electrolytes and fluid levels. This regulation is crucial for maintaining homeostasis, which allows the body to function properly. The urinary system ensures that any excess substances that could be harmful if accumulated in the body are efficiently excreted, which serves to protect the overall health of the animal. Additionally, by balancing fluid levels, the urinary system helps maintain blood pressure and fluid equilibrium in the body.