Final answer:
The urinary system osmoregulates blood and water by filtering waste products and excess water from the blood, thus maintaining the body's internal balance of fluids and solutes.
Step-by-step explanation:
The urinary system plays a crucial role in maintaining the body's internal environment. It includes organs such as the kidneys, ureters, urinary bladder, and urethra. The kidneys, which are a pair of bean-shaped organs, filter excess water, mineral ions, and waste products like urea from the blood. These wastes are by-products of metabolism, specifically from the breakdown of proteins and nucleic acids. The kidneys regulate the concentration of urine based on the body's hydration levels through the process of osmoregulation.
This process involves the reabsorption of water and soluble substances like sodium and chloride ions, which happens in the nephrons, the functional units of the kidneys. As urine is formed, it travels down the ureters to the urinary bladder, where it is stored until excretion through the urethra.