Which system is responsible for controlling the discharge of waste materials filtered from the blood and excreted as urine?

The urinary system is primarily responsible for filtering waste materials from the blood and excreting them as urine. This system includes the kidneys, ureters, bladder, and urethra. The kidneys filter the blood to remove waste products and excess substances, producing urine in the process. The urine is then transported through the ureters to the bladder, where it is stored until it is excreted through the urethra.

The other systems listed have distinct functions that do not involve waste excretion in the same manner. The respiratory system is mainly responsible for gas exchange, allowing oxygen intake and carbon dioxide elimination. The endocrine system regulates bodily functions through hormones but does not directly handle waste elimination. The nervous system coordinates bodily functions and responses but does not manage the filtration and excretion of waste products from the body. Thus, the urinary system is the correct choice as the primary system for waste management through urine production.